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Finding the Fourth Proportional to 395.06, 545.01 and 239.78

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Solution

The fourth proportional to 395.06, 545.01 and 239.78 is: 330.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.06 : 545.01 = 239.78 : x
  2. Step 2: Convert to fraction form
    395.06/545.01 = 239.78/x
  3. Step 3: Cross multiply
    395.06x = 545.01 × 239.78
  4. Step 4: Simplify right side
    395.06x = 130,682.50
  5. Step 5: Solve for x
    x = 130,682.50/395.06
  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.