Home / 81,142.20-121,713.30-78,031.80

Finding the Fourth Proportional to 81,142.20, 121,713.30 and 78,031.80

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Solution

The fourth proportional to 81,142.20, 121,713.30 and 78,031.80 is: 117,047.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,142.20 : 121,713.30 = 78,031.80 : x
  2. Step 2: Convert to fraction form
    81,142.20/121,713.30 = 78,031.80/x
  3. Step 3: Cross multiply
    81,142.20x = 121,713.30 × 78,031.80
  4. Step 4: Simplify right side
    81,142.20x = 9,497,507,882.94
  5. Step 5: Solve for x
    x = 9,497,507,882.94/81,142.20
  6. Step 6: Final answer
    x = 117,047.70

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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.