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Finding the Fourth Proportional to 395.63, 545.84 and 248.21

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Solution

The fourth proportional to 395.63, 545.84 and 248.21 is: 342.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.63 : 545.84 = 248.21 : x
  2. Step 2: Convert to fraction form
    395.63/545.84 = 248.21/x
  3. Step 3: Cross multiply
    395.63x = 545.84 × 248.21
  4. Step 4: Simplify right side
    395.63x = 135,478.98
  5. Step 5: Solve for x
    x = 135,478.98/395.63
  6. Step 6: Final answer
    x = 342.44

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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.