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Finding the Fourth Proportional to 128,532.70, 192,799.05 and 75,915.10

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Solution

The fourth proportional to 128,532.70, 192,799.05 and 75,915.10 is: 113,872.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,532.70 : 192,799.05 = 75,915.10 : x
  2. Step 2: Convert to fraction form
    128,532.70/192,799.05 = 75,915.10/x
  3. Step 3: Cross multiply
    128,532.70x = 192,799.05 × 75,915.10
  4. Step 4: Simplify right side
    128,532.70x = 14,636,359,160.66
  5. Step 5: Solve for x
    x = 14,636,359,160.66/128,532.70
  6. Step 6: Final answer
    x = 113,872.65

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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.