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Finding the Fourth Proportional to 318.93, 439.49 and 269.72

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Solution

The fourth proportional to 318.93, 439.49 and 269.72 is: 371.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.93 : 439.49 = 269.72 : x
  2. Step 2: Convert to fraction form
    318.93/439.49 = 269.72/x
  3. Step 3: Cross multiply
    318.93x = 439.49 × 269.72
  4. Step 4: Simplify right side
    318.93x = 118,539.24
  5. Step 5: Solve for x
    x = 118,539.24/318.93
  6. Step 6: Final answer
    x = 371.68

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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.