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Finding the Fourth Proportional to 80,860.80, 121,291.20 and 71,019.30

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Solution

The fourth proportional to 80,860.80, 121,291.20 and 71,019.30 is: 106,528.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,860.80 : 121,291.20 = 71,019.30 : x
  2. Step 2: Convert to fraction form
    80,860.80/121,291.20 = 71,019.30/x
  3. Step 3: Cross multiply
    80,860.80x = 121,291.20 × 71,019.30
  4. Step 4: Simplify right side
    80,860.80x = 8,614,016,120.16
  5. Step 5: Solve for x
    x = 8,614,016,120.16/80,860.80
  6. Step 6: Final answer
    x = 106,528.95

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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.