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Finding the Fourth Proportional to 154.76, 213.35 and 117.85

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Solution

The fourth proportional to 154.76, 213.35 and 117.85 is: 162.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.76 : 213.35 = 117.85 : x
  2. Step 2: Convert to fraction form
    154.76/213.35 = 117.85/x
  3. Step 3: Cross multiply
    154.76x = 213.35 × 117.85
  4. Step 4: Simplify right side
    154.76x = 25,143.06
  5. Step 5: Solve for x
    x = 25,143.06/154.76
  6. Step 6: Final answer
    x = 162.47

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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.