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Finding the Fourth Proportional to 80,693.60, 121,040.40 and 77,280.80

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Solution

The fourth proportional to 80,693.60, 121,040.40 and 77,280.80 is: 115,921.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,693.60 : 121,040.40 = 77,280.80 : x
  2. Step 2: Convert to fraction form
    80,693.60/121,040.40 = 77,280.80/x
  3. Step 3: Cross multiply
    80,693.60x = 121,040.40 × 77,280.80
  4. Step 4: Simplify right side
    80,693.60x = 9,354,098,944.32
  5. Step 5: Solve for x
    x = 9,354,098,944.32/80,693.60
  6. Step 6: Final answer
    x = 115,921.20

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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.