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Finding the Fourth Proportional to 121.30, 167.38 and 72.18

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Solution

The fourth proportional to 121.30, 167.38 and 72.18 is: 99.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.30 : 167.38 = 72.18 : x
  2. Step 2: Convert to fraction form
    121.30/167.38 = 72.18/x
  3. Step 3: Cross multiply
    121.30x = 167.38 × 72.18
  4. Step 4: Simplify right side
    121.30x = 12,081.49
  5. Step 5: Solve for x
    x = 12,081.49/121.30
  6. Step 6: Final answer
    x = 99.60

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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.