Home / 121,398.28-167,470.09-81,121.95

Finding the Fourth Proportional to 121,398.28, 167,470.09 and 81,121.95

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Solution

The fourth proportional to 121,398.28, 167,470.09 and 81,121.95 is: 111,908.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,398.28 : 167,470.09 = 81,121.95 : x
  2. Step 2: Convert to fraction form
    121,398.28/167,470.09 = 81,121.95/x
  3. Step 3: Cross multiply
    121,398.28x = 167,470.09 × 81,121.95
  4. Step 4: Simplify right side
    121,398.28x = 13,585,500,064.67
  5. Step 5: Solve for x
    x = 13,585,500,064.67/121,398.28
  6. Step 6: Final answer
    x = 111,908.51

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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.