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Finding the Fourth Proportional to 80,287.85, 110,572.52 and 78,544.39

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Solution

The fourth proportional to 80,287.85, 110,572.52 and 78,544.39 is: 108,171.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,287.85 : 110,572.52 = 78,544.39 : x
  2. Step 2: Convert to fraction form
    80,287.85/110,572.52 = 78,544.39/x
  3. Step 3: Cross multiply
    80,287.85x = 110,572.52 × 78,544.39
  4. Step 4: Simplify right side
    80,287.85x = 8,684,851,134.16
  5. Step 5: Solve for x
    x = 8,684,851,134.16/80,287.85
  6. Step 6: Final answer
    x = 108,171.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.