Home / 648,139.20-972,208.80-424,190.40

Finding the Fourth Proportional to 648,139.20, 972,208.80 and 424,190.40

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Solution

The fourth proportional to 648,139.20, 972,208.80 and 424,190.40 is: 636,285.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    648,139.20 : 972,208.80 = 424,190.40 : x
  2. Step 2: Convert to fraction form
    648,139.20/972,208.80 = 424,190.40/x
  3. Step 3: Cross multiply
    648,139.20x = 972,208.80 × 424,190.40
  4. Step 4: Simplify right side
    648,139.20x = 412,401,639,755.52
  5. Step 5: Solve for x
    x = 412,401,639,755.52/648,139.20
  6. Step 6: Final answer
    x = 636,285.60

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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.