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Finding the Fourth Proportional to 285,487.16, 393,988.77 and 156,425.87

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Solution

The fourth proportional to 285,487.16, 393,988.77 and 156,425.87 is: 215,876.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,487.16 : 393,988.77 = 156,425.87 : x
  2. Step 2: Convert to fraction form
    285,487.16/393,988.77 = 156,425.87/x
  3. Step 3: Cross multiply
    285,487.16x = 393,988.77 × 156,425.87
  4. Step 4: Simplify right side
    285,487.16x = 61,630,034,147.54
  5. Step 5: Solve for x
    x = 61,630,034,147.54/285,487.16
  6. Step 6: Final answer
    x = 215,876.73

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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.