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Finding the Fourth Proportional to 715,572.32, 987,513.44 and 393,293.84

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Solution

The fourth proportional to 715,572.32, 987,513.44 and 393,293.84 is: 542,758.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,572.32 : 987,513.44 = 393,293.84 : x
  2. Step 2: Convert to fraction form
    715,572.32/987,513.44 = 393,293.84/x
  3. Step 3: Cross multiply
    715,572.32x = 987,513.44 × 393,293.84
  4. Step 4: Simplify right side
    715,572.32x = 388,382,952,869.21
  5. Step 5: Solve for x
    x = 388,382,952,869.21/715,572.32
  6. Step 6: Final answer
    x = 542,758.49

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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.