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Finding the Fourth Proportional to 128,493.29, 177,315.17 and 71,129.22

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Solution

The fourth proportional to 128,493.29, 177,315.17 and 71,129.22 is: 98,155.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,493.29 : 177,315.17 = 71,129.22 : x
  2. Step 2: Convert to fraction form
    128,493.29/177,315.17 = 71,129.22/x
  3. Step 3: Cross multiply
    128,493.29x = 177,315.17 × 71,129.22
  4. Step 4: Simplify right side
    128,493.29x = 12,612,289,380.62
  5. Step 5: Solve for x
    x = 12,612,289,380.62/128,493.29
  6. Step 6: Final answer
    x = 98,155.24

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1.5x scale

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.