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Finding the Fourth Proportional to 715,758.65, 987,727.43 and 393,468.83

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Solution

The fourth proportional to 715,758.65, 987,727.43 and 393,468.83 is: 542,976.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,758.65 : 987,727.43 = 393,468.83 : x
  2. Step 2: Convert to fraction form
    715,758.65/987,727.43 = 393,468.83/x
  3. Step 3: Cross multiply
    715,758.65x = 987,727.43 × 393,468.83
  4. Step 4: Simplify right side
    715,758.65x = 388,639,956,241.01
  5. Step 5: Solve for x
    x = 388,639,956,241.01/715,758.65
  6. Step 6: Final answer
    x = 542,976.26

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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.