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Finding the Fourth Proportional to 185.50, 278.19 and 139.66

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Solution

The fourth proportional to 185.50, 278.19 and 139.66 is: 209.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.50 : 278.19 = 139.66 : x
  2. Step 2: Convert to fraction form
    185.50/278.19 = 139.66/x
  3. Step 3: Cross multiply
    185.50x = 278.19 × 139.66
  4. Step 4: Simplify right side
    185.50x = 38,852.02
  5. Step 5: Solve for x
    x = 38,852.02/185.50
  6. Step 6: Final answer
    x = 209.44

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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.