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Finding the Fourth Proportional to 319.24, 439.65 and 274.66

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Solution

The fourth proportional to 319.24, 439.65 and 274.66 is: 378.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.24 : 439.65 = 274.66 : x
  2. Step 2: Convert to fraction form
    319.24/439.65 = 274.66/x
  3. Step 3: Cross multiply
    319.24x = 439.65 × 274.66
  4. Step 4: Simplify right side
    319.24x = 120,754.27
  5. Step 5: Solve for x
    x = 120,754.27/319.24
  6. Step 6: Final answer
    x = 378.26

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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.