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Finding the Fourth Proportional to 138,916.28, 191,703.12 and 75,250.28

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Solution

The fourth proportional to 138,916.28, 191,703.12 and 75,250.28 is: 103,844.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,916.28 : 191,703.12 = 75,250.28 : x
  2. Step 2: Convert to fraction form
    138,916.28/191,703.12 = 75,250.28/x
  3. Step 3: Cross multiply
    138,916.28x = 191,703.12 × 75,250.28
  4. Step 4: Simplify right side
    138,916.28x = 14,425,713,456.87
  5. Step 5: Solve for x
    x = 14,425,713,456.87/138,916.28
  6. Step 6: Final answer
    x = 103,844.66

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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.