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Finding the Fourth Proportional to 132,458.40, 198,687.60 and 85,219.20

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Solution

The fourth proportional to 132,458.40, 198,687.60 and 85,219.20 is: 127,828.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,458.40 : 198,687.60 = 85,219.20 : x
  2. Step 2: Convert to fraction form
    132,458.40/198,687.60 = 85,219.20/x
  3. Step 3: Cross multiply
    132,458.40x = 198,687.60 × 85,219.20
  4. Step 4: Simplify right side
    132,458.40x = 16,931,998,321.92
  5. Step 5: Solve for x
    x = 16,931,998,321.92/132,458.40
  6. Step 6: Final answer
    x = 127,828.80

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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.