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Finding the Fourth Proportional to 395.57, 545.81 and 248.15

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Solution

The fourth proportional to 395.57, 545.81 and 248.15 is: 342.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.57 : 545.81 = 248.15 : x
  2. Step 2: Convert to fraction form
    395.57/545.81 = 248.15/x
  3. Step 3: Cross multiply
    395.57x = 545.81 × 248.15
  4. Step 4: Simplify right side
    395.57x = 135,442.88
  5. Step 5: Solve for x
    x = 135,442.88/395.57
  6. Step 6: Final answer
    x = 342.40

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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.