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Finding the Fourth Proportional to 121.84, 167.72 and 101.08

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Solution

The fourth proportional to 121.84, 167.72 and 101.08 is: 139.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.84 : 167.72 = 101.08 : x
  2. Step 2: Convert to fraction form
    121.84/167.72 = 101.08/x
  3. Step 3: Cross multiply
    121.84x = 167.72 × 101.08
  4. Step 4: Simplify right side
    121.84x = 16,952.84
  5. Step 5: Solve for x
    x = 16,952.84/121.84
  6. Step 6: Final answer
    x = 139.14

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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.