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Finding the Fourth Proportional to 154.11, 212.61 and 104.97

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Solution

The fourth proportional to 154.11, 212.61 and 104.97 is: 144.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.11 : 212.61 = 104.97 : x
  2. Step 2: Convert to fraction form
    154.11/212.61 = 104.97/x
  3. Step 3: Cross multiply
    154.11x = 212.61 × 104.97
  4. Step 4: Simplify right side
    154.11x = 22,317.67
  5. Step 5: Solve for x
    x = 22,317.67/154.11
  6. Step 6: Final answer
    x = 144.82

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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.