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Finding the Fourth Proportional to 154.78, 213.74 and 117.92

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Solution

The fourth proportional to 154.78, 213.74 and 117.92 is: 162.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.78 : 213.74 = 117.92 : x
  2. Step 2: Convert to fraction form
    154.78/213.74 = 117.92/x
  3. Step 3: Cross multiply
    154.78x = 213.74 × 117.92
  4. Step 4: Simplify right side
    154.78x = 25,204.61
  5. Step 5: Solve for x
    x = 25,204.61/154.78
  6. Step 6: Final answer
    x = 162.84

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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.