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Finding the Fourth Proportional to 154.85, 213.64 and 108.17

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Solution

The fourth proportional to 154.85, 213.64 and 108.17 is: 149.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.85 : 213.64 = 108.17 : x
  2. Step 2: Convert to fraction form
    154.85/213.64 = 108.17/x
  3. Step 3: Cross multiply
    154.85x = 213.64 × 108.17
  4. Step 4: Simplify right side
    154.85x = 23,108.90
  5. Step 5: Solve for x
    x = 23,108.90/154.85
  6. Step 6: Final answer
    x = 149.24

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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.