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Finding the Fourth Proportional to 185.78, 256.28 and 139.08

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Solution

The fourth proportional to 185.78, 256.28 and 139.08 is: 191.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.78 : 256.28 = 139.08 : x
  2. Step 2: Convert to fraction form
    185.78/256.28 = 139.08/x
  3. Step 3: Cross multiply
    185.78x = 256.28 × 139.08
  4. Step 4: Simplify right side
    185.78x = 35,643.42
  5. Step 5: Solve for x
    x = 35,643.42/185.78
  6. Step 6: Final answer
    x = 191.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.