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Finding the Fourth Proportional to 317.62, 438.92 and 285.22

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Solution

The fourth proportional to 317.62, 438.92 and 285.22 is: 394.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.62 : 438.92 = 285.22 : x
  2. Step 2: Convert to fraction form
    317.62/438.92 = 285.22/x
  3. Step 3: Cross multiply
    317.62x = 438.92 × 285.22
  4. Step 4: Simplify right side
    317.62x = 125,188.76
  5. Step 5: Solve for x
    x = 125,188.76/317.62
  6. Step 6: Final answer
    x = 394.15

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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.