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Finding the Fourth Proportional to 121.76, 167.93 and 109.61

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Solution

The fourth proportional to 121.76, 167.93 and 109.61 is: 151.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.76 : 167.93 = 109.61 : x
  2. Step 2: Convert to fraction form
    121.76/167.93 = 109.61/x
  3. Step 3: Cross multiply
    121.76x = 167.93 × 109.61
  4. Step 4: Simplify right side
    121.76x = 18,407.71
  5. Step 5: Solve for x
    x = 18,407.71/121.76
  6. Step 6: Final answer
    x = 151.17

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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.