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Finding the Fourth Proportional to 395.55, 545.90 and 240.39

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Solution

The fourth proportional to 395.55, 545.90 and 240.39 is: 331.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.55 : 545.90 = 240.39 : x
  2. Step 2: Convert to fraction form
    395.55/545.90 = 240.39/x
  3. Step 3: Cross multiply
    395.55x = 545.90 × 240.39
  4. Step 4: Simplify right side
    395.55x = 131,226.77
  5. Step 5: Solve for x
    x = 131,226.77/395.55
  6. Step 6: Final answer
    x = 331.76

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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.