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Finding the Fourth Proportional to 664,164.48, 991,517.28 and 640,836.48

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Solution

The fourth proportional to 664,164.48, 991,517.28 and 640,836.48 is: 956,691.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,164.48 : 991,517.28 = 640,836.48 : x
  2. Step 2: Convert to fraction form
    664,164.48/991,517.28 = 640,836.48/x
  3. Step 3: Cross multiply
    664,164.48x = 991,517.28 × 640,836.48
  4. Step 4: Simplify right side
    664,164.48x = 635,400,443,574.37
  5. Step 5: Solve for x
    x = 635,400,443,574.37/664,164.48
  6. Step 6: Final answer
    x = 956,691.40

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.