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Finding the Fourth Proportional to 128,997.56, 178,006.88 and 72,398

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Solution

The fourth proportional to 128,997.56, 178,006.88 and 72,398 is: 99,903.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,997.56 : 178,006.88 = 72,398 : x
  2. Step 2: Convert to fraction form
    128,997.56/178,006.88 = 72,398/x
  3. Step 3: Cross multiply
    128,997.56x = 178,006.88 × 72,398
  4. Step 4: Simplify right side
    128,997.56x = 12,887,342,098.24
  5. Step 5: Solve for x
    x = 12,887,342,098.24/128,997.56
  6. Step 6: Final answer
    x = 99,903.77

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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.