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Finding the Fourth Proportional to 154.65, 213.42 and 84.71

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Solution

The fourth proportional to 154.65, 213.42 and 84.71 is: 116.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.65 : 213.42 = 84.71 : x
  2. Step 2: Convert to fraction form
    154.65/213.42 = 84.71/x
  3. Step 3: Cross multiply
    154.65x = 213.42 × 84.71
  4. Step 4: Simplify right side
    154.65x = 18,078.38
  5. Step 5: Solve for x
    x = 18,078.38/154.65
  6. Step 6: Final answer
    x = 116.90

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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.