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Finding the Fourth Proportional to 80,742.29, 121,871.87 and 80,742.29

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Solution

The fourth proportional to 80,742.29, 121,871.87 and 80,742.29 is: 121,871.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,742.29 : 121,871.87 = 80,742.29 : x
  2. Step 2: Convert to fraction form
    80,742.29/121,871.87 = 80,742.29/x
  3. Step 3: Cross multiply
    80,742.29x = 121,871.87 × 80,742.29
  4. Step 4: Simplify right side
    80,742.29x = 9,840,213,870.38
  5. Step 5: Solve for x
    x = 9,840,213,870.38/80,742.29
  6. Step 6: Final answer
    x = 121,871.87

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.