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Finding the Fourth Proportional to 153.87, 212.64 and 116.97

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Solution

The fourth proportional to 153.87, 212.64 and 116.97 is: 161.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.87 : 212.64 = 116.97 : x
  2. Step 2: Convert to fraction form
    153.87/212.64 = 116.97/x
  3. Step 3: Cross multiply
    153.87x = 212.64 × 116.97
  4. Step 4: Simplify right side
    153.87x = 24,872.50
  5. Step 5: Solve for x
    x = 24,872.50/153.87
  6. Step 6: Final answer
    x = 161.65

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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.