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Finding the Fourth Proportional to 121.47, 167.62 and 69.72

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Solution

The fourth proportional to 121.47, 167.62 and 69.72 is: 96.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.47 : 167.62 = 69.72 : x
  2. Step 2: Convert to fraction form
    121.47/167.62 = 69.72/x
  3. Step 3: Cross multiply
    121.47x = 167.62 × 69.72
  4. Step 4: Simplify right side
    121.47x = 11,686.47
  5. Step 5: Solve for x
    x = 11,686.47/121.47
  6. Step 6: Final answer
    x = 96.21

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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.