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Finding the Fourth Proportional to 85,766.64, 128,712.60 and 85,115.04

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Solution

The fourth proportional to 85,766.64, 128,712.60 and 85,115.04 is: 127,734.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,766.64 : 128,712.60 = 85,115.04 : x
  2. Step 2: Convert to fraction form
    85,766.64/128,712.60 = 85,115.04/x
  3. Step 3: Cross multiply
    85,766.64x = 128,712.60 × 85,115.04
  4. Step 4: Simplify right side
    85,766.64x = 10,955,378,097.50
  5. Step 5: Solve for x
    x = 10,955,378,097.50/85,766.64
  6. Step 6: Final answer
    x = 127,734.72

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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.