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Finding the Fourth Proportional to 170.88, 256.08 and 128

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Solution

The fourth proportional to 170.88, 256.08 and 128 is: 191.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.88 : 256.08 = 128 : x
  2. Step 2: Convert to fraction form
    170.88/256.08 = 128/x
  3. Step 3: Cross multiply
    170.88x = 256.08 × 128
  4. Step 4: Simplify right side
    170.88x = 32,778.24
  5. Step 5: Solve for x
    x = 32,778.24/170.88
  6. Step 6: Final answer
    x = 191.82

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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.