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Finding the Fourth Proportional to 154.79, 213.61 and 84.85

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Solution

The fourth proportional to 154.79, 213.61 and 84.85 is: 117.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.79 : 213.61 = 84.85 : x
  2. Step 2: Convert to fraction form
    154.79/213.61 = 84.85/x
  3. Step 3: Cross multiply
    154.79x = 213.61 × 84.85
  4. Step 4: Simplify right side
    154.79x = 18,124.46
  5. Step 5: Solve for x
    x = 18,124.46/154.79
  6. Step 6: Final answer
    x = 117.09

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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.