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Finding the Fourth Proportional to 80,447.60, 120,129.61 and 65,685.32

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Solution

The fourth proportional to 80,447.60, 120,129.61 and 65,685.32 is: 98,085.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,447.60 : 120,129.61 = 65,685.32 : x
  2. Step 2: Convert to fraction form
    80,447.60/120,129.61 = 65,685.32/x
  3. Step 3: Cross multiply
    80,447.60x = 120,129.61 × 65,685.32
  4. Step 4: Simplify right side
    80,447.60x = 7,890,751,874.33
  5. Step 5: Solve for x
    x = 7,890,751,874.33/80,447.60
  6. Step 6: Final answer
    x = 98,085.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.