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Finding the Fourth Proportional to 136.88, 204.84 and 128

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Solution

The fourth proportional to 136.88, 204.84 and 128 is: 191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.88 : 204.84 = 128 : x
  2. Step 2: Convert to fraction form
    136.88/204.84 = 128/x
  3. Step 3: Cross multiply
    136.88x = 204.84 × 128
  4. Step 4: Simplify right side
    136.88x = 26,219.52
  5. Step 5: Solve for x
    x = 26,219.52/136.88
  6. Step 6: Final answer
    x = 191.55

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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.