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Finding the Fourth Proportional to 170.76, 256.21 and 68.12

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Solution

The fourth proportional to 170.76, 256.21 and 68.12 is: 102.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.76 : 256.21 = 68.12 : x
  2. Step 2: Convert to fraction form
    170.76/256.21 = 68.12/x
  3. Step 3: Cross multiply
    170.76x = 256.21 × 68.12
  4. Step 4: Simplify right side
    170.76x = 17,451.57
  5. Step 5: Solve for x
    x = 17,451.57/170.76
  6. Step 6: Final answer
    x = 102.20

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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.