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Finding the Fourth Proportional to 316.62, 474.21 and 255.47

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Solution

The fourth proportional to 316.62, 474.21 and 255.47 is: 382.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.62 : 474.21 = 255.47 : x
  2. Step 2: Convert to fraction form
    316.62/474.21 = 255.47/x
  3. Step 3: Cross multiply
    316.62x = 474.21 × 255.47
  4. Step 4: Simplify right side
    316.62x = 121,144.06
  5. Step 5: Solve for x
    x = 121,144.06/316.62
  6. Step 6: Final answer
    x = 382.62

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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.