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Finding the Fourth Proportional to 317.76, 439.04 and 280.96

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Solution

The fourth proportional to 317.76, 439.04 and 280.96 is: 388.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.76 : 439.04 = 280.96 : x
  2. Step 2: Convert to fraction form
    317.76/439.04 = 280.96/x
  3. Step 3: Cross multiply
    317.76x = 439.04 × 280.96
  4. Step 4: Simplify right side
    317.76x = 123,352.68
  5. Step 5: Solve for x
    x = 123,352.68/317.76
  6. Step 6: Final answer
    x = 388.19

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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.