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Finding the Fourth Proportional to 154.57, 213.13 and 117.71

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Solution

The fourth proportional to 154.57, 213.13 and 117.71 is: 162.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.57 : 213.13 = 117.71 : x
  2. Step 2: Convert to fraction form
    154.57/213.13 = 117.71/x
  3. Step 3: Cross multiply
    154.57x = 213.13 × 117.71
  4. Step 4: Simplify right side
    154.57x = 25,087.53
  5. Step 5: Solve for x
    x = 25,087.53/154.57
  6. Step 6: Final answer
    x = 162.31

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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.