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Finding the Fourth Proportional to 113.81, 156.85 and 86.11

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Solution

The fourth proportional to 113.81, 156.85 and 86.11 is: 118.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.81 : 156.85 = 86.11 : x
  2. Step 2: Convert to fraction form
    113.81/156.85 = 86.11/x
  3. Step 3: Cross multiply
    113.81x = 156.85 × 86.11
  4. Step 4: Simplify right side
    113.81x = 13,505.75
  5. Step 5: Solve for x
    x = 13,505.75/113.81
  6. Step 6: Final answer
    x = 118.67

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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.