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Finding the Fourth Proportional to 128,732.53, 177,650.88 and 71,371.67

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Solution

The fourth proportional to 128,732.53, 177,650.88 and 71,371.67 is: 98,492.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,732.53 : 177,650.88 = 71,371.67 : x
  2. Step 2: Convert to fraction form
    128,732.53/177,650.88 = 71,371.67/x
  3. Step 3: Cross multiply
    128,732.53x = 177,650.88 × 71,371.67
  4. Step 4: Simplify right side
    128,732.53x = 12,679,239,982.57
  5. Step 5: Solve for x
    x = 12,679,239,982.57/128,732.53
  6. Step 6: Final answer
    x = 98,492.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.