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Finding the Fourth Proportional to 113.57, 170.40 and 55.85

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Solution

The fourth proportional to 113.57, 170.40 and 55.85 is: 83.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.57 : 170.40 = 55.85 : x
  2. Step 2: Convert to fraction form
    113.57/170.40 = 55.85/x
  3. Step 3: Cross multiply
    113.57x = 170.40 × 55.85
  4. Step 4: Simplify right side
    113.57x = 9,515.99
  5. Step 5: Solve for x
    x = 9,515.99/113.57
  6. Step 6: Final answer
    x = 83.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.