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Finding the Fourth Proportional to 395.99, 545.89 and 271.45

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Solution

The fourth proportional to 395.99, 545.89 and 271.45 is: 374.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.99 : 545.89 = 271.45 : x
  2. Step 2: Convert to fraction form
    395.99/545.89 = 271.45/x
  3. Step 3: Cross multiply
    395.99x = 545.89 × 271.45
  4. Step 4: Simplify right side
    395.99x = 148,179.80
  5. Step 5: Solve for x
    x = 148,179.80/395.99
  6. Step 6: Final answer
    x = 374.21

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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.