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Finding the Fourth Proportional to 185.78, 278.40 and 140.11

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Solution

The fourth proportional to 185.78, 278.40 and 140.11 is: 209.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.78 : 278.40 = 140.11 : x
  2. Step 2: Convert to fraction form
    185.78/278.40 = 140.11/x
  3. Step 3: Cross multiply
    185.78x = 278.40 × 140.11
  4. Step 4: Simplify right side
    185.78x = 39,005.93
  5. Step 5: Solve for x
    x = 39,005.93/185.78
  6. Step 6: Final answer
    x = 209.95

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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.