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Finding the Fourth Proportional to 121.84, 168.24 and 101.36

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Solution

The fourth proportional to 121.84, 168.24 and 101.36 is: 139.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.84 : 168.24 = 101.36 : x
  2. Step 2: Convert to fraction form
    121.84/168.24 = 101.36/x
  3. Step 3: Cross multiply
    121.84x = 168.24 × 101.36
  4. Step 4: Simplify right side
    121.84x = 17,052.81
  5. Step 5: Solve for x
    x = 17,052.81/121.84
  6. Step 6: Final answer
    x = 139.96

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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.