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Finding the Fourth Proportional to 113.82, 170.05 and 84.40

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Solution

The fourth proportional to 113.82, 170.05 and 84.40 is: 126.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.82 : 170.05 = 84.40 : x
  2. Step 2: Convert to fraction form
    113.82/170.05 = 84.40/x
  3. Step 3: Cross multiply
    113.82x = 170.05 × 84.40
  4. Step 4: Simplify right side
    113.82x = 14,351.80
  5. Step 5: Solve for x
    x = 14,351.80/113.82
  6. Step 6: Final answer
    x = 126.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.