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Finding the Fourth Proportional to 113.85, 157.28 and 87.66

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Solution

The fourth proportional to 113.85, 157.28 and 87.66 is: 121.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.85 : 157.28 = 87.66 : x
  2. Step 2: Convert to fraction form
    113.85/157.28 = 87.66/x
  3. Step 3: Cross multiply
    113.85x = 157.28 × 87.66
  4. Step 4: Simplify right side
    113.85x = 13,786.73
  5. Step 5: Solve for x
    x = 13,786.73/113.85
  6. Step 6: Final answer
    x = 121.10

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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.