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Finding the Fourth Proportional to 133.85, 200.78 and 61.72

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Solution

The fourth proportional to 133.85, 200.78 and 61.72 is: 92.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.85 : 200.78 = 61.72 : x
  2. Step 2: Convert to fraction form
    133.85/200.78 = 61.72/x
  3. Step 3: Cross multiply
    133.85x = 200.78 × 61.72
  4. Step 4: Simplify right side
    133.85x = 12,391.56
  5. Step 5: Solve for x
    x = 12,391.56/133.85
  6. Step 6: Final answer
    x = 92.58

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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.