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Finding the Fourth Proportional to 218,886.32, 328,134.60 and 85,861.52

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Solution

The fourth proportional to 218,886.32, 328,134.60 and 85,861.52 is: 128,715.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,886.32 : 328,134.60 = 85,861.52 : x
  2. Step 2: Convert to fraction form
    218,886.32/328,134.60 = 85,861.52/x
  3. Step 3: Cross multiply
    218,886.32x = 328,134.60 × 85,861.52
  4. Step 4: Simplify right side
    218,886.32x = 28,174,135,520.59
  5. Step 5: Solve for x
    x = 28,174,135,520.59/218,886.32
  6. Step 6: Final answer
    x = 128,715.84

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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.