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Finding the Fourth Proportional to 153.87, 212.41 and 98.69

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Solution

The fourth proportional to 153.87, 212.41 and 98.69 is: 136.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.87 : 212.41 = 98.69 : x
  2. Step 2: Convert to fraction form
    153.87/212.41 = 98.69/x
  3. Step 3: Cross multiply
    153.87x = 212.41 × 98.69
  4. Step 4: Simplify right side
    153.87x = 20,961.68
  5. Step 5: Solve for x
    x = 20,961.68/153.87
  6. Step 6: Final answer
    x = 136.23

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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.