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Finding the Fourth Proportional to 147.17, 220.75 and 121.65

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Solution

The fourth proportional to 147.17, 220.75 and 121.65 is: 182.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.17 : 220.75 = 121.65 : x
  2. Step 2: Convert to fraction form
    147.17/220.75 = 121.65/x
  3. Step 3: Cross multiply
    147.17x = 220.75 × 121.65
  4. Step 4: Simplify right side
    147.17x = 26,854.69
  5. Step 5: Solve for x
    x = 26,854.69/147.17
  6. Step 6: Final answer
    x = 182.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.