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Finding the Fourth Proportional to 113.76, 157.05 and 80.55

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Solution

The fourth proportional to 113.76, 157.05 and 80.55 is: 111.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.76 : 157.05 = 80.55 : x
  2. Step 2: Convert to fraction form
    113.76/157.05 = 80.55/x
  3. Step 3: Cross multiply
    113.76x = 157.05 × 80.55
  4. Step 4: Simplify right side
    113.76x = 12,650.38
  5. Step 5: Solve for x
    x = 12,650.38/113.76
  6. Step 6: Final answer
    x = 111.20

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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.