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Finding the Fourth Proportional to 394.71, 545.15 and 247.47

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Solution

The fourth proportional to 394.71, 545.15 and 247.47 is: 341.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.71 : 545.15 = 247.47 : x
  2. Step 2: Convert to fraction form
    394.71/545.15 = 247.47/x
  3. Step 3: Cross multiply
    394.71x = 545.15 × 247.47
  4. Step 4: Simplify right side
    394.71x = 134,907.03
  5. Step 5: Solve for x
    x = 134,907.03/394.71
  6. Step 6: Final answer
    x = 341.79

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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.