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Finding the Fourth Proportional to 136.51, 204.78 and 49.85

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Solution

The fourth proportional to 136.51, 204.78 and 49.85 is: 74.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.51 : 204.78 = 49.85 : x
  2. Step 2: Convert to fraction form
    136.51/204.78 = 49.85/x
  3. Step 3: Cross multiply
    136.51x = 204.78 × 49.85
  4. Step 4: Simplify right side
    136.51x = 10,208.28
  5. Step 5: Solve for x
    x = 10,208.28/136.51
  6. Step 6: Final answer
    x = 74.78

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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.