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Finding the Fourth Proportional to 641,721.40, 962,582.10 and 442,655.80

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Solution

The fourth proportional to 641,721.40, 962,582.10 and 442,655.80 is: 663,983.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,721.40 : 962,582.10 = 442,655.80 : x
  2. Step 2: Convert to fraction form
    641,721.40/962,582.10 = 442,655.80/x
  3. Step 3: Cross multiply
    641,721.40x = 962,582.10 × 442,655.80
  4. Step 4: Simplify right side
    641,721.40x = 426,092,549,541.18
  5. Step 5: Solve for x
    x = 426,092,549,541.18/641,721.40
  6. Step 6: Final answer
    x = 663,983.70

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.