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Finding the Fourth Proportional to 121.62, 168.69 and 117.30

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Solution

The fourth proportional to 121.62, 168.69 and 117.30 is: 162.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.62 : 168.69 = 117.30 : x
  2. Step 2: Convert to fraction form
    121.62/168.69 = 117.30/x
  3. Step 3: Cross multiply
    121.62x = 168.69 × 117.30
  4. Step 4: Simplify right side
    121.62x = 19,787.34
  5. Step 5: Solve for x
    x = 19,787.34/121.62
  6. Step 6: Final answer
    x = 162.70

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.