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Finding the Fourth Proportional to 349.12, 482.21 and 255.72

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Solution

The fourth proportional to 349.12, 482.21 and 255.72 is: 353.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.12 : 482.21 = 255.72 : x
  2. Step 2: Convert to fraction form
    349.12/482.21 = 255.72/x
  3. Step 3: Cross multiply
    349.12x = 482.21 × 255.72
  4. Step 4: Simplify right side
    349.12x = 123,310.74
  5. Step 5: Solve for x
    x = 123,310.74/349.12
  6. Step 6: Final answer
    x = 353.20

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.