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Finding the Fourth Proportional to 317.72, 439.22 and 284.92

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Solution

The fourth proportional to 317.72, 439.22 and 284.92 is: 393.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.72 : 439.22 = 284.92 : x
  2. Step 2: Convert to fraction form
    317.72/439.22 = 284.92/x
  3. Step 3: Cross multiply
    317.72x = 439.22 × 284.92
  4. Step 4: Simplify right side
    317.72x = 125,142.18
  5. Step 5: Solve for x
    x = 125,142.18/317.72
  6. Step 6: Final answer
    x = 393.87

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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.