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Finding the Fourth Proportional to 154.62, 213.39 and 89.15

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Solution

The fourth proportional to 154.62, 213.39 and 89.15 is: 123.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.62 : 213.39 = 89.15 : x
  2. Step 2: Convert to fraction form
    154.62/213.39 = 89.15/x
  3. Step 3: Cross multiply
    154.62x = 213.39 × 89.15
  4. Step 4: Simplify right side
    154.62x = 19,022.65
  5. Step 5: Solve for x
    x = 19,022.65/154.62
  6. Step 6: Final answer
    x = 123.03

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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.