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Finding the Fourth Proportional to 153.38, 211.60 and 87.88

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Solution

The fourth proportional to 153.38, 211.60 and 87.88 is: 121.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.38 : 211.60 = 87.88 : x
  2. Step 2: Convert to fraction form
    153.38/211.60 = 87.88/x
  3. Step 3: Cross multiply
    153.38x = 211.60 × 87.88
  4. Step 4: Simplify right side
    153.38x = 18,595.41
  5. Step 5: Solve for x
    x = 18,595.41/153.38
  6. Step 6: Final answer
    x = 121.24

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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.