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Finding the Fourth Proportional to 132,436.80, 198,136.80 and 85,780.80

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Solution

The fourth proportional to 132,436.80, 198,136.80 and 85,780.80 is: 128,335.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,436.80 : 198,136.80 = 85,780.80 : x
  2. Step 2: Convert to fraction form
    132,436.80/198,136.80 = 85,780.80/x
  3. Step 3: Cross multiply
    132,436.80x = 198,136.80 × 85,780.80
  4. Step 4: Simplify right side
    132,436.80x = 16,996,333,213.44
  5. Step 5: Solve for x
    x = 16,996,333,213.44/132,436.80
  6. Step 6: Final answer
    x = 128,335.43

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1.5x scale

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.