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Finding the Fourth Proportional to 121.49, 167.66 and 72.37

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Solution

The fourth proportional to 121.49, 167.66 and 72.37 is: 99.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.49 : 167.66 = 72.37 : x
  2. Step 2: Convert to fraction form
    121.49/167.66 = 72.37/x
  3. Step 3: Cross multiply
    121.49x = 167.66 × 72.37
  4. Step 4: Simplify right side
    121.49x = 12,134.26
  5. Step 5: Solve for x
    x = 12,134.26/121.49
  6. Step 6: Final answer
    x = 99.88

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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.