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Finding the Fourth Proportional to 80,680.60, 121,020.90 and 28,053.10

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Solution

The fourth proportional to 80,680.60, 121,020.90 and 28,053.10 is: 42,079.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,680.60 : 121,020.90 = 28,053.10 : x
  2. Step 2: Convert to fraction form
    80,680.60/121,020.90 = 28,053.10/x
  3. Step 3: Cross multiply
    80,680.60x = 121,020.90 × 28,053.10
  4. Step 4: Simplify right side
    80,680.60x = 3,395,011,409.79
  5. Step 5: Solve for x
    x = 3,395,011,409.79/80,680.60
  6. Step 6: Final answer
    x = 42,079.65

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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.