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Finding the Fourth Proportional to 395.82, 545.90 and 343.98

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Solution

The fourth proportional to 395.82, 545.90 and 343.98 is: 474.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.82 : 545.90 = 343.98 : x
  2. Step 2: Convert to fraction form
    395.82/545.90 = 343.98/x
  3. Step 3: Cross multiply
    395.82x = 545.90 × 343.98
  4. Step 4: Simplify right side
    395.82x = 187,778.68
  5. Step 5: Solve for x
    x = 187,778.68/395.82
  6. Step 6: Final answer
    x = 474.40

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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.