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Finding the Fourth Proportional to 80,738,211.20, 121,107,316.80 and 80,738,211.20

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Solution

The fourth proportional to 80,738,211.20, 121,107,316.80 and 80,738,211.20 is: 121,107,316.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,738,211.20 : 121,107,316.80 = 80,738,211.20 : x
  2. Step 2: Convert to fraction form
    80,738,211.20/121,107,316.80 = 80,738,211.20/x
  3. Step 3: Cross multiply
    80,738,211.20x = 121,107,316.80 × 80,738,211.20
  4. Step 4: Simplify right side
    80,738,211.20x = 9,777,988,121,663,708
  5. Step 5: Solve for x
    x = 9,777,988,121,663,708/80,738,211.20
  6. Step 6: Final answer
    x = 121,107,316.80

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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.