Home / 715,721.87-987,708.45-393,445.55

Finding the Fourth Proportional to 715,721.87, 987,708.45 and 393,445.55

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Solution

The fourth proportional to 715,721.87, 987,708.45 and 393,445.55 is: 542,961.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,721.87 : 987,708.45 = 393,445.55 : x
  2. Step 2: Convert to fraction form
    715,721.87/987,708.45 = 393,445.55/x
  3. Step 3: Cross multiply
    715,721.87x = 987,708.45 × 393,445.55
  4. Step 4: Simplify right side
    715,721.87x = 388,609,489,411.36
  5. Step 5: Solve for x
    x = 388,609,489,411.36/715,721.87
  6. Step 6: Final answer
    x = 542,961.60

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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.