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Finding the Fourth Proportional to 80,900.76, 121,405.80 and 28,310.70

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Solution

The fourth proportional to 80,900.76, 121,405.80 and 28,310.70 is: 42,485.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,900.76 : 121,405.80 = 28,310.70 : x
  2. Step 2: Convert to fraction form
    80,900.76/121,405.80 = 28,310.70/x
  3. Step 3: Cross multiply
    80,900.76x = 121,405.80 × 28,310.70
  4. Step 4: Simplify right side
    80,900.76x = 3,437,083,182.06
  5. Step 5: Solve for x
    x = 3,437,083,182.06/80,900.76
  6. Step 6: Final answer
    x = 42,485.18

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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.