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Finding the Fourth Proportional to 113.87, 157.01 and 87.55

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Solution

The fourth proportional to 113.87, 157.01 and 87.55 is: 120.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.87 : 157.01 = 87.55 : x
  2. Step 2: Convert to fraction form
    113.87/157.01 = 87.55/x
  3. Step 3: Cross multiply
    113.87x = 157.01 × 87.55
  4. Step 4: Simplify right side
    113.87x = 13,745.40
  5. Step 5: Solve for x
    x = 13,745.40/113.87
  6. Step 6: Final answer
    x = 120.71

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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.