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Finding the Fourth Proportional to 170.89, 256.21 and 68.20

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Solution

The fourth proportional to 170.89, 256.21 and 68.20 is: 102.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.89 : 256.21 = 68.20 : x
  2. Step 2: Convert to fraction form
    170.89/256.21 = 68.20/x
  3. Step 3: Cross multiply
    170.89x = 256.21 × 68.20
  4. Step 4: Simplify right side
    170.89x = 17,472.71
  5. Step 5: Solve for x
    x = 17,472.71/170.89
  6. Step 6: Final answer
    x = 102.25

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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.