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Finding the Fourth Proportional to 144.43, 215.48 and 121.66

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Solution

The fourth proportional to 144.43, 215.48 and 121.66 is: 181.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.43 : 215.48 = 121.66 : x
  2. Step 2: Convert to fraction form
    144.43/215.48 = 121.66/x
  3. Step 3: Cross multiply
    144.43x = 215.48 × 121.66
  4. Step 4: Simplify right side
    144.43x = 26,215.06
  5. Step 5: Solve for x
    x = 26,215.06/144.43
  6. Step 6: Final answer
    x = 181.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.