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Finding the Fourth Proportional to 128,251.89, 176,983.99 and 71,663.27

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Solution

The fourth proportional to 128,251.89, 176,983.99 and 71,663.27 is: 98,893.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,251.89 : 176,983.99 = 71,663.27 : x
  2. Step 2: Convert to fraction form
    128,251.89/176,983.99 = 71,663.27/x
  3. Step 3: Cross multiply
    128,251.89x = 176,983.99 × 71,663.27
  4. Step 4: Simplify right side
    128,251.89x = 12,683,250,396.97
  5. Step 5: Solve for x
    x = 12,683,250,396.97/128,251.89
  6. Step 6: Final answer
    x = 98,893.28

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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.