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Finding the Fourth Proportional to 316.62, 476.15 and 255.87

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Solution

The fourth proportional to 316.62, 476.15 and 255.87 is: 384.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.62 : 476.15 = 255.87 : x
  2. Step 2: Convert to fraction form
    316.62/476.15 = 255.87/x
  3. Step 3: Cross multiply
    316.62x = 476.15 × 255.87
  4. Step 4: Simplify right side
    316.62x = 121,831.22
  5. Step 5: Solve for x
    x = 121,831.22/316.62
  6. Step 6: Final answer
    x = 384.79

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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.