Home / 138,545.20-191,192.16-81,956.80

Finding the Fourth Proportional to 138,545.20, 191,192.16 and 81,956.80

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Solution

The fourth proportional to 138,545.20, 191,192.16 and 81,956.80 is: 113,100.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,545.20 : 191,192.16 = 81,956.80 : x
  2. Step 2: Convert to fraction form
    138,545.20/191,192.16 = 81,956.80/x
  3. Step 3: Cross multiply
    138,545.20x = 191,192.16 × 81,956.80
  4. Step 4: Simplify right side
    138,545.20x = 15,669,497,618.69
  5. Step 5: Solve for x
    x = 15,669,497,618.69/138,545.20
  6. Step 6: Final answer
    x = 113,100.26

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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.