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Finding the Fourth Proportional to 121,391.68, 167,425.56 and 78,963.76

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Solution

The fourth proportional to 121,391.68, 167,425.56 and 78,963.76 is: 108,908.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,391.68 : 167,425.56 = 78,963.76 : x
  2. Step 2: Convert to fraction form
    121,391.68/167,425.56 = 78,963.76/x
  3. Step 3: Cross multiply
    121,391.68x = 167,425.56 × 78,963.76
  4. Step 4: Simplify right side
    121,391.68x = 13,220,551,737.71
  5. Step 5: Solve for x
    x = 13,220,551,737.71/121,391.68
  6. Step 6: Final answer
    x = 108,908.22

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1.5x scale

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.