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Finding the Fourth Proportional to 185.72, 278.18 and 139.93

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Solution

The fourth proportional to 185.72, 278.18 and 139.93 is: 209.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.72 : 278.18 = 139.93 : x
  2. Step 2: Convert to fraction form
    185.72/278.18 = 139.93/x
  3. Step 3: Cross multiply
    185.72x = 278.18 × 139.93
  4. Step 4: Simplify right side
    185.72x = 38,924.86
  5. Step 5: Solve for x
    x = 38,924.86/185.72
  6. Step 6: Final answer
    x = 209.59

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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.