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Finding the Fourth Proportional to 80,905.20, 121,336.20 and 28,309.20

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Solution

The fourth proportional to 80,905.20, 121,336.20 and 28,309.20 is: 42,456.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,905.20 : 121,336.20 = 28,309.20 : x
  2. Step 2: Convert to fraction form
    80,905.20/121,336.20 = 28,309.20/x
  3. Step 3: Cross multiply
    80,905.20x = 121,336.20 × 28,309.20
  4. Step 4: Simplify right side
    80,905.20x = 3,434,930,753.04
  5. Step 5: Solve for x
    x = 3,434,930,753.04/80,905.20
  6. Step 6: Final answer
    x = 42,456.24

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1.5x scale

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.