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Finding the Fourth Proportional to 85,765.12, 128,680.96 and 69,278.72

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Solution

The fourth proportional to 85,765.12, 128,680.96 and 69,278.72 is: 103,944.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,765.12 : 128,680.96 = 69,278.72 : x
  2. Step 2: Convert to fraction form
    85,765.12/128,680.96 = 69,278.72/x
  3. Step 3: Cross multiply
    85,765.12x = 128,680.96 × 69,278.72
  4. Step 4: Simplify right side
    85,765.12x = 8,914,852,197.17
  5. Step 5: Solve for x
    x = 8,914,852,197.17/85,765.12
  6. Step 6: Final answer
    x = 103,944.96

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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.