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Finding the Fourth Proportional to 154.12, 212.68 and 91.95

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Solution

The fourth proportional to 154.12, 212.68 and 91.95 is: 126.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.12 : 212.68 = 91.95 : x
  2. Step 2: Convert to fraction form
    154.12/212.68 = 91.95/x
  3. Step 3: Cross multiply
    154.12x = 212.68 × 91.95
  4. Step 4: Simplify right side
    154.12x = 19,555.93
  5. Step 5: Solve for x
    x = 19,555.93/154.12
  6. Step 6: Final answer
    x = 126.89

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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.