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Finding the Fourth Proportional to 154.38, 213.05 and 87.99

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Solution

The fourth proportional to 154.38, 213.05 and 87.99 is: 121.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.38 : 213.05 = 87.99 : x
  2. Step 2: Convert to fraction form
    154.38/213.05 = 87.99/x
  3. Step 3: Cross multiply
    154.38x = 213.05 × 87.99
  4. Step 4: Simplify right side
    154.38x = 18,746.27
  5. Step 5: Solve for x
    x = 18,746.27/154.38
  6. Step 6: Final answer
    x = 121.43

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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.