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Finding the Fourth Proportional to 80,938.40, 121,407.60 and 72,409.10

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Solution

The fourth proportional to 80,938.40, 121,407.60 and 72,409.10 is: 108,613.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,938.40 : 121,407.60 = 72,409.10 : x
  2. Step 2: Convert to fraction form
    80,938.40/121,407.60 = 72,409.10/x
  3. Step 3: Cross multiply
    80,938.40x = 121,407.60 × 72,409.10
  4. Step 4: Simplify right side
    80,938.40x = 8,791,015,049.16
  5. Step 5: Solve for x
    x = 8,791,015,049.16/80,938.40
  6. Step 6: Final answer
    x = 108,613.65

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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.