Home / 121,729.12-167,897.22-81,371.92

Finding the Fourth Proportional to 121,729.12, 167,897.22 and 81,371.92

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Solution

The fourth proportional to 121,729.12, 167,897.22 and 81,371.92 is: 112,233.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,729.12 : 167,897.22 = 81,371.92 : x
  2. Step 2: Convert to fraction form
    121,729.12/167,897.22 = 81,371.92/x
  3. Step 3: Cross multiply
    121,729.12x = 167,897.22 × 81,371.92
  4. Step 4: Simplify right side
    121,729.12x = 13,662,119,154.06
  5. Step 5: Solve for x
    x = 13,662,119,154.06/121,729.12
  6. Step 6: Final answer
    x = 112,233.78

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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.