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Finding the Fourth Proportional to 154.12, 212.59 and 101.65

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Solution

The fourth proportional to 154.12, 212.59 and 101.65 is: 140.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.12 : 212.59 = 101.65 : x
  2. Step 2: Convert to fraction form
    154.12/212.59 = 101.65/x
  3. Step 3: Cross multiply
    154.12x = 212.59 × 101.65
  4. Step 4: Simplify right side
    154.12x = 21,608.96
  5. Step 5: Solve for x
    x = 21,608.96/154.12
  6. Step 6: Final answer
    x = 140.21

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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.