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Finding the Fourth Proportional to 80,876.40, 121,314.60 and 28,291.20

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Solution

The fourth proportional to 80,876.40, 121,314.60 and 28,291.20 is: 42,436.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,876.40 : 121,314.60 = 28,291.20 : x
  2. Step 2: Convert to fraction form
    80,876.40/121,314.60 = 28,291.20/x
  3. Step 3: Cross multiply
    80,876.40x = 121,314.60 × 28,291.20
  4. Step 4: Simplify right side
    80,876.40x = 3,432,135,611.52
  5. Step 5: Solve for x
    x = 3,432,135,611.52/80,876.40
  6. Step 6: Final answer
    x = 42,436.80

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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.