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Finding the Fourth Proportional to 154.24, 212.85 and 87.85

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Solution

The fourth proportional to 154.24, 212.85 and 87.85 is: 121.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.24 : 212.85 = 87.85 : x
  2. Step 2: Convert to fraction form
    154.24/212.85 = 87.85/x
  3. Step 3: Cross multiply
    154.24x = 212.85 × 87.85
  4. Step 4: Simplify right side
    154.24x = 18,698.21
  5. Step 5: Solve for x
    x = 18,698.21/154.24
  6. Step 6: Final answer
    x = 121.23

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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.