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Finding the Fourth Proportional to 80,587.31, 120,880.76 and 21,422.95

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Solution

The fourth proportional to 80,587.31, 120,880.76 and 21,422.95 is: 32,134.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,587.31 : 120,880.76 = 21,422.95 : x
  2. Step 2: Convert to fraction form
    80,587.31/120,880.76 = 21,422.95/x
  3. Step 3: Cross multiply
    80,587.31x = 120,880.76 × 21,422.95
  4. Step 4: Simplify right side
    80,587.31x = 2,589,622,068.13
  5. Step 5: Solve for x
    x = 2,589,622,068.13/80,587.31
  6. Step 6: Final answer
    x = 32,134.37

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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.