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Finding the Fourth Proportional to 80,486.60, 120,187.81 and 65,724.32

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Solution

The fourth proportional to 80,486.60, 120,187.81 and 65,724.32 is: 98,143.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,486.60 : 120,187.81 = 65,724.32 : x
  2. Step 2: Convert to fraction form
    80,486.60/120,187.81 = 65,724.32/x
  3. Step 3: Cross multiply
    80,486.60x = 120,187.81 × 65,724.32
  4. Step 4: Simplify right side
    80,486.60x = 7,899,262,084.54
  5. Step 5: Solve for x
    x = 7,899,262,084.54/80,486.60
  6. Step 6: Final answer
    x = 98,143.82

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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.