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Finding the Fourth Proportional to 113.38, 156.39 and 87.11

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Solution

The fourth proportional to 113.38, 156.39 and 87.11 is: 120.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.38 : 156.39 = 87.11 : x
  2. Step 2: Convert to fraction form
    113.38/156.39 = 87.11/x
  3. Step 3: Cross multiply
    113.38x = 156.39 × 87.11
  4. Step 4: Simplify right side
    113.38x = 13,623.13
  5. Step 5: Solve for x
    x = 13,623.13/113.38
  6. Step 6: Final answer
    x = 120.15

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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.