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Finding the Fourth Proportional to 131,128, 180,957.60 and 71,512

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Solution

The fourth proportional to 131,128, 180,957.60 and 71,512 is: 98,687.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,128 : 180,957.60 = 71,512 : x
  2. Step 2: Convert to fraction form
    131,128/180,957.60 = 71,512/x
  3. Step 3: Cross multiply
    131,128x = 180,957.60 × 71,512
  4. Step 4: Simplify right side
    131,128x = 12,940,639,891.20
  5. Step 5: Solve for x
    x = 12,940,639,891.20/131,128
  6. Step 6: Final answer
    x = 98,687.08

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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.