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Finding the Fourth Proportional to 185.55, 278.19 and 139.65

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Solution

The fourth proportional to 185.55, 278.19 and 139.65 is: 209.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.55 : 278.19 = 139.65 : x
  2. Step 2: Convert to fraction form
    185.55/278.19 = 139.65/x
  3. Step 3: Cross multiply
    185.55x = 278.19 × 139.65
  4. Step 4: Simplify right side
    185.55x = 38,849.23
  5. Step 5: Solve for x
    x = 38,849.23/185.55
  6. Step 6: Final answer
    x = 209.37

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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.