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Finding the Fourth Proportional to 113.96, 157.52 and 85.12

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Solution

The fourth proportional to 113.96, 157.52 and 85.12 is: 117.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.96 : 157.52 = 85.12 : x
  2. Step 2: Convert to fraction form
    113.96/157.52 = 85.12/x
  3. Step 3: Cross multiply
    113.96x = 157.52 × 85.12
  4. Step 4: Simplify right side
    113.96x = 13,408.10
  5. Step 5: Solve for x
    x = 13,408.10/113.96
  6. Step 6: Final answer
    x = 117.66

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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.