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Finding the Fourth Proportional to 124.42, 170.68 and 121.22

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Solution

The fourth proportional to 124.42, 170.68 and 121.22 is: 166.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.42 : 170.68 = 121.22 : x
  2. Step 2: Convert to fraction form
    124.42/170.68 = 121.22/x
  3. Step 3: Cross multiply
    124.42x = 170.68 × 121.22
  4. Step 4: Simplify right side
    124.42x = 20,689.83
  5. Step 5: Solve for x
    x = 20,689.83/124.42
  6. Step 6: Final answer
    x = 166.29

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.