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Finding the Fourth Proportional to 170.89, 256.42 and 79.48

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Solution

The fourth proportional to 170.89, 256.42 and 79.48 is: 119.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.89 : 256.42 = 79.48 : x
  2. Step 2: Convert to fraction form
    170.89/256.42 = 79.48/x
  3. Step 3: Cross multiply
    170.89x = 256.42 × 79.48
  4. Step 4: Simplify right side
    170.89x = 20,378.58
  5. Step 5: Solve for x
    x = 20,378.58/170.89
  6. Step 6: Final answer
    x = 119.25

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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.