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Finding the Fourth Proportional to 136.74, 204.75 and 85.28

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Solution

The fourth proportional to 136.74, 204.75 and 85.28 is: 127.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.74 : 204.75 = 85.28 : x
  2. Step 2: Convert to fraction form
    136.74/204.75 = 85.28/x
  3. Step 3: Cross multiply
    136.74x = 204.75 × 85.28
  4. Step 4: Simplify right side
    136.74x = 17,461.20
  5. Step 5: Solve for x
    x = 17,461.20/136.74
  6. Step 6: Final answer
    x = 127.69

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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.