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Finding the Fourth Proportional to 113.85, 157.12 and 64.73

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Solution

The fourth proportional to 113.85, 157.12 and 64.73 is: 89.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.85 : 157.12 = 64.73 : x
  2. Step 2: Convert to fraction form
    113.85/157.12 = 64.73/x
  3. Step 3: Cross multiply
    113.85x = 157.12 × 64.73
  4. Step 4: Simplify right side
    113.85x = 10,170.61
  5. Step 5: Solve for x
    x = 10,170.61/113.85
  6. Step 6: Final answer
    x = 89.33

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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.