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Finding the Fourth Proportional to 715,519.28, 987,440.28 and 393,240.80

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Solution

The fourth proportional to 715,519.28, 987,440.28 and 393,240.80 is: 542,685.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,519.28 : 987,440.28 = 393,240.80 : x
  2. Step 2: Convert to fraction form
    715,519.28/987,440.28 = 393,240.80/x
  3. Step 3: Cross multiply
    715,519.28x = 987,440.28 × 393,240.80
  4. Step 4: Simplify right side
    715,519.28x = 388,301,805,659.42
  5. Step 5: Solve for x
    x = 388,301,805,659.42/715,519.28
  6. Step 6: Final answer
    x = 542,685.31

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Double scale
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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.