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Finding the Fourth Proportional to 136.76, 204.85 and 90.96

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Solution

The fourth proportional to 136.76, 204.85 and 90.96 is: 136.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.76 : 204.85 = 90.96 : x
  2. Step 2: Convert to fraction form
    136.76/204.85 = 90.96/x
  3. Step 3: Cross multiply
    136.76x = 204.85 × 90.96
  4. Step 4: Simplify right side
    136.76x = 18,632.50
  5. Step 5: Solve for x
    x = 18,632.50/136.76
  6. Step 6: Final answer
    x = 136.25

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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.