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Finding the Fourth Proportional to 185.45, 278.22 and 139.82

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Solution

The fourth proportional to 185.45, 278.22 and 139.82 is: 209.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.45 : 278.22 = 139.82 : x
  2. Step 2: Convert to fraction form
    185.45/278.22 = 139.82/x
  3. Step 3: Cross multiply
    185.45x = 278.22 × 139.82
  4. Step 4: Simplify right side
    185.45x = 38,900.72
  5. Step 5: Solve for x
    x = 38,900.72/185.45
  6. Step 6: Final answer
    x = 209.76

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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.