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Finding the Fourth Proportional to 715,734.58, 987,714.87 and 393,446.71

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Solution

The fourth proportional to 715,734.58, 987,714.87 and 393,446.71 is: 542,957.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,734.58 : 987,714.87 = 393,446.71 : x
  2. Step 2: Convert to fraction form
    715,734.58/987,714.87 = 393,446.71/x
  3. Step 3: Cross multiply
    715,734.58x = 987,714.87 × 393,446.71
  4. Step 4: Simplify right side
    715,734.58x = 388,613,166,019.58
  5. Step 5: Solve for x
    x = 388,613,166,019.58/715,734.58
  6. Step 6: Final answer
    x = 542,957.09

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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.