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Finding the Fourth Proportional to 128,912.87, 177,910.47 and 71,557.58

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Solution

The fourth proportional to 128,912.87, 177,910.47 and 71,557.58 is: 98,755.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,912.87 : 177,910.47 = 71,557.58 : x
  2. Step 2: Convert to fraction form
    128,912.87/177,910.47 = 71,557.58/x
  3. Step 3: Cross multiply
    128,912.87x = 177,910.47 × 71,557.58
  4. Step 4: Simplify right side
    128,912.87x = 12,730,841,800.31
  5. Step 5: Solve for x
    x = 12,730,841,800.31/128,912.87
  6. Step 6: Final answer
    x = 98,755.40

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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.