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Finding the Fourth Proportional to 247.78, 342.12 and 185.72

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Solution

The fourth proportional to 247.78, 342.12 and 185.72 is: 256.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.78 : 342.12 = 185.72 : x
  2. Step 2: Convert to fraction form
    247.78/342.12 = 185.72/x
  3. Step 3: Cross multiply
    247.78x = 342.12 × 185.72
  4. Step 4: Simplify right side
    247.78x = 63,538.53
  5. Step 5: Solve for x
    x = 63,538.53/247.78
  6. Step 6: Final answer
    x = 256.43

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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.