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Finding the Fourth Proportional to 715,727.34, 987,717.85 and 393,467.42

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Solution

The fourth proportional to 715,727.34, 987,717.85 and 393,467.42 is: 542,992.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,727.34 : 987,717.85 = 393,467.42 : x
  2. Step 2: Convert to fraction form
    715,727.34/987,717.85 = 393,467.42/x
  3. Step 3: Cross multiply
    715,727.34x = 987,717.85 × 393,467.42
  4. Step 4: Simplify right side
    715,727.34x = 388,634,795,613.07
  5. Step 5: Solve for x
    x = 388,634,795,613.07/715,727.34
  6. Step 6: Final answer
    x = 542,992.80

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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.