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Finding the Fourth Proportional to 395.07, 545.42 and 247.78

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Solution

The fourth proportional to 395.07, 545.42 and 247.78 is: 342.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.07 : 545.42 = 247.78 : x
  2. Step 2: Convert to fraction form
    395.07/545.42 = 247.78/x
  3. Step 3: Cross multiply
    395.07x = 545.42 × 247.78
  4. Step 4: Simplify right side
    395.07x = 135,144.17
  5. Step 5: Solve for x
    x = 135,144.17/395.07
  6. Step 6: Final answer
    x = 342.08

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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.