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Finding the Fourth Proportional to 113.34, 156.42 and 80.21

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Solution

The fourth proportional to 113.34, 156.42 and 80.21 is: 110.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.34 : 156.42 = 80.21 : x
  2. Step 2: Convert to fraction form
    113.34/156.42 = 80.21/x
  3. Step 3: Cross multiply
    113.34x = 156.42 × 80.21
  4. Step 4: Simplify right side
    113.34x = 12,545.68
  5. Step 5: Solve for x
    x = 12,545.68/113.34
  6. Step 6: Final answer
    x = 110.69

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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.