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Finding the Fourth Proportional to 121.18, 167.24 and 117.40

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Solution

The fourth proportional to 121.18, 167.24 and 117.40 is: 162.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.18 : 167.24 = 117.40 : x
  2. Step 2: Convert to fraction form
    121.18/167.24 = 117.40/x
  3. Step 3: Cross multiply
    121.18x = 167.24 × 117.40
  4. Step 4: Simplify right side
    121.18x = 19,633.98
  5. Step 5: Solve for x
    x = 19,633.98/121.18
  6. Step 6: Final answer
    x = 162.02

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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.