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Finding the Fourth Proportional to 715,545.28, 987,476.16 and 393,266.80

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Solution

The fourth proportional to 715,545.28, 987,476.16 and 393,266.80 is: 542,721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,545.28 : 987,476.16 = 393,266.80 : x
  2. Step 2: Convert to fraction form
    715,545.28/987,476.16 = 393,266.80/x
  3. Step 3: Cross multiply
    715,545.28x = 987,476.16 × 393,266.80
  4. Step 4: Simplify right side
    715,545.28x = 388,341,589,519.49
  5. Step 5: Solve for x
    x = 388,341,589,519.49/715,545.28
  6. Step 6: Final answer
    x = 542,721.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.