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Finding the Fourth Proportional to 170.76, 256.06 and 84.22

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Solution

The fourth proportional to 170.76, 256.06 and 84.22 is: 126.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.76 : 256.06 = 84.22 : x
  2. Step 2: Convert to fraction form
    170.76/256.06 = 84.22/x
  3. Step 3: Cross multiply
    170.76x = 256.06 × 84.22
  4. Step 4: Simplify right side
    170.76x = 21,565.37
  5. Step 5: Solve for x
    x = 21,565.37/170.76
  6. Step 6: Final answer
    x = 126.29

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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.