Home / 80,985.60-121,425.60-72,691.20

Finding the Fourth Proportional to 80,985.60, 121,425.60 and 72,691.20

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Solution

The fourth proportional to 80,985.60, 121,425.60 and 72,691.20 is: 108,989.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,985.60 : 121,425.60 = 72,691.20 : x
  2. Step 2: Convert to fraction form
    80,985.60/121,425.60 = 72,691.20/x
  3. Step 3: Cross multiply
    80,985.60x = 121,425.60 × 72,691.20
  4. Step 4: Simplify right side
    80,985.60x = 8,826,572,574.72
  5. Step 5: Solve for x
    x = 8,826,572,574.72/80,985.60
  6. Step 6: Final answer
    x = 108,989.41

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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.