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Finding the Fourth Proportional to 316.78, 437.20 and 185.79

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Solution

The fourth proportional to 316.78, 437.20 and 185.79 is: 256.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.78 : 437.20 = 185.79 : x
  2. Step 2: Convert to fraction form
    316.78/437.20 = 185.79/x
  3. Step 3: Cross multiply
    316.78x = 437.20 × 185.79
  4. Step 4: Simplify right side
    316.78x = 81,227.62
  5. Step 5: Solve for x
    x = 81,227.62/316.78
  6. Step 6: Final answer
    x = 256.42

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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.