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Finding the Fourth Proportional to 113.96, 157.18 and 81.20

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Solution

The fourth proportional to 113.96, 157.18 and 81.20 is: 112.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.96 : 157.18 = 81.20 : x
  2. Step 2: Convert to fraction form
    113.96/157.18 = 81.20/x
  3. Step 3: Cross multiply
    113.96x = 157.18 × 81.20
  4. Step 4: Simplify right side
    113.96x = 12,763.02
  5. Step 5: Solve for x
    x = 12,763.02/113.96
  6. Step 6: Final answer
    x = 112.00

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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.