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Finding the Fourth Proportional to 318.48, 439.73 and 207.91

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Solution

The fourth proportional to 318.48, 439.73 and 207.91 is: 287.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.48 : 439.73 = 207.91 : x
  2. Step 2: Convert to fraction form
    318.48/439.73 = 207.91/x
  3. Step 3: Cross multiply
    318.48x = 439.73 × 207.91
  4. Step 4: Simplify right side
    318.48x = 91,424.26
  5. Step 5: Solve for x
    x = 91,424.26/318.48
  6. Step 6: Final answer
    x = 287.06

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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.