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Finding the Fourth Proportional to 128,239.88, 176,971.10 and 71,651.25

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Solution

The fourth proportional to 128,239.88, 176,971.10 and 71,651.25 is: 98,878.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,239.88 : 176,971.10 = 71,651.25 : x
  2. Step 2: Convert to fraction form
    128,239.88/176,971.10 = 71,651.25/x
  3. Step 3: Cross multiply
    128,239.88x = 176,971.10 × 71,651.25
  4. Step 4: Simplify right side
    128,239.88x = 12,680,200,170.62
  5. Step 5: Solve for x
    x = 12,680,200,170.62/128,239.88
  6. Step 6: Final answer
    x = 98,878.76

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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.