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Finding the Fourth Proportional to 715,690.29, 987,641.49 and 393,393.45

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Solution

The fourth proportional to 715,690.29, 987,641.49 and 393,393.45 is: 542,876.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,690.29 : 987,641.49 = 393,393.45 : x
  2. Step 2: Convert to fraction form
    715,690.29/987,641.49 = 393,393.45/x
  3. Step 3: Cross multiply
    715,690.29x = 987,641.49 × 393,393.45
  4. Step 4: Simplify right side
    715,690.29x = 388,531,693,114.24
  5. Step 5: Solve for x
    x = 388,531,693,114.24/715,690.29
  6. Step 6: Final answer
    x = 542,876.85

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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.