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Finding the Fourth Proportional to 80,687.80, 121,031.70 and 73,430.20

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Solution

The fourth proportional to 80,687.80, 121,031.70 and 73,430.20 is: 110,145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,687.80 : 121,031.70 = 73,430.20 : x
  2. Step 2: Convert to fraction form
    80,687.80/121,031.70 = 73,430.20/x
  3. Step 3: Cross multiply
    80,687.80x = 121,031.70 × 73,430.20
  4. Step 4: Simplify right side
    80,687.80x = 8,887,381,937.34
  5. Step 5: Solve for x
    x = 8,887,381,937.34/80,687.80
  6. Step 6: Final answer
    x = 110,145.30

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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.