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Finding the Fourth Proportional to 319.28, 439.16 and 272.72

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Solution

The fourth proportional to 319.28, 439.16 and 272.72 is: 375.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.28 : 439.16 = 272.72 : x
  2. Step 2: Convert to fraction form
    319.28/439.16 = 272.72/x
  3. Step 3: Cross multiply
    319.28x = 439.16 × 272.72
  4. Step 4: Simplify right side
    319.28x = 119,767.72
  5. Step 5: Solve for x
    x = 119,767.72/319.28
  6. Step 6: Final answer
    x = 375.12

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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.