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Finding the Fourth Proportional to 42,540.80, 63,808.87 and 12,956.16

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Solution

The fourth proportional to 42,540.80, 63,808.87 and 12,956.16 is: 19,433.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,540.80 : 63,808.87 = 12,956.16 : x
  2. Step 2: Convert to fraction form
    42,540.80/63,808.87 = 12,956.16/x
  3. Step 3: Cross multiply
    42,540.80x = 63,808.87 × 12,956.16
  4. Step 4: Simplify right side
    42,540.80x = 826,717,545.31
  5. Step 5: Solve for x
    x = 826,717,545.31/42,540.80
  6. Step 6: Final answer
    x = 19,433.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.