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Finding the Fourth Proportional to 318.48, 439.77 and 239.66

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Solution

The fourth proportional to 318.48, 439.77 and 239.66 is: 330.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.48 : 439.77 = 239.66 : x
  2. Step 2: Convert to fraction form
    318.48/439.77 = 239.66/x
  3. Step 3: Cross multiply
    318.48x = 439.77 × 239.66
  4. Step 4: Simplify right side
    318.48x = 105,393.52
  5. Step 5: Solve for x
    x = 105,393.52/318.48
  6. Step 6: Final answer
    x = 330.93

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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.