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Finding the Fourth Proportional to 395.70, 545.31 and 343.86

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Solution

The fourth proportional to 395.70, 545.31 and 343.86 is: 473.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.70 : 545.31 = 343.86 : x
  2. Step 2: Convert to fraction form
    395.70/545.31 = 343.86/x
  3. Step 3: Cross multiply
    395.70x = 545.31 × 343.86
  4. Step 4: Simplify right side
    395.70x = 187,510.30
  5. Step 5: Solve for x
    x = 187,510.30/395.70
  6. Step 6: Final answer
    x = 473.87

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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.