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Finding the Fourth Proportional to 154.15, 212.69 and 98.87

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Solution

The fourth proportional to 154.15, 212.69 and 98.87 is: 136.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.15 : 212.69 = 98.87 : x
  2. Step 2: Convert to fraction form
    154.15/212.69 = 98.87/x
  3. Step 3: Cross multiply
    154.15x = 212.69 × 98.87
  4. Step 4: Simplify right side
    154.15x = 21,028.66
  5. Step 5: Solve for x
    x = 21,028.66/154.15
  6. Step 6: Final answer
    x = 136.42

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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.