Home / 138,781.13-191,519.54-81,421.46

Finding the Fourth Proportional to 138,781.13, 191,519.54 and 81,421.46

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Solution

The fourth proportional to 138,781.13, 191,519.54 and 81,421.46 is: 112,362.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,781.13 : 191,519.54 = 81,421.46 : x
  2. Step 2: Convert to fraction form
    138,781.13/191,519.54 = 81,421.46/x
  3. Step 3: Cross multiply
    138,781.13x = 191,519.54 × 81,421.46
  4. Step 4: Simplify right side
    138,781.13x = 15,593,801,247.68
  5. Step 5: Solve for x
    x = 15,593,801,247.68/138,781.13
  6. Step 6: Final answer
    x = 112,362.55

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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.