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Finding the Fourth Proportional to 648,139.70, 972,209.55 and 424,190.90

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Solution

The fourth proportional to 648,139.70, 972,209.55 and 424,190.90 is: 636,286.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    648,139.70 : 972,209.55 = 424,190.90 : x
  2. Step 2: Convert to fraction form
    648,139.70/972,209.55 = 424,190.90/x
  3. Step 3: Cross multiply
    648,139.70x = 972,209.55 × 424,190.90
  4. Step 4: Simplify right side
    648,139.70x = 412,402,444,003.10
  5. Step 5: Solve for x
    x = 412,402,444,003.10/648,139.70
  6. Step 6: Final answer
    x = 636,286.35

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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.