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Finding the Fourth Proportional to 395.04, 545.20 and 239.68

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Solution

The fourth proportional to 395.04, 545.20 and 239.68 is: 330.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.04 : 545.20 = 239.68 : x
  2. Step 2: Convert to fraction form
    395.04/545.20 = 239.68/x
  3. Step 3: Cross multiply
    395.04x = 545.20 × 239.68
  4. Step 4: Simplify right side
    395.04x = 130,673.54
  5. Step 5: Solve for x
    x = 130,673.54/395.04
  6. Step 6: Final answer
    x = 330.79

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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.