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Finding the Fourth Proportional to 113.71, 170.70 and 85.15

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Solution

The fourth proportional to 113.71, 170.70 and 85.15 is: 127.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.71 : 170.70 = 85.15 : x
  2. Step 2: Convert to fraction form
    113.71/170.70 = 85.15/x
  3. Step 3: Cross multiply
    113.71x = 170.70 × 85.15
  4. Step 4: Simplify right side
    113.71x = 14,535.11
  5. Step 5: Solve for x
    x = 14,535.11/113.71
  6. Step 6: Final answer
    x = 127.83

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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.