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Finding the Fourth Proportional to 80,655.71, 120,983.16 and 20,683.92

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Solution

The fourth proportional to 80,655.71, 120,983.16 and 20,683.92 is: 31,025.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,655.71 : 120,983.16 = 20,683.92 : x
  2. Step 2: Convert to fraction form
    80,655.71/120,983.16 = 20,683.92/x
  3. Step 3: Cross multiply
    80,655.71x = 120,983.16 × 20,683.92
  4. Step 4: Simplify right side
    80,655.71x = 2,502,406,002.79
  5. Step 5: Solve for x
    x = 2,502,406,002.79/80,655.71
  6. Step 6: Final answer
    x = 31,025.78

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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.