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Finding the Fourth Proportional to 394.95, 545.03 and 217.91

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Solution

The fourth proportional to 394.95, 545.03 and 217.91 is: 300.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.95 : 545.03 = 217.91 : x
  2. Step 2: Convert to fraction form
    394.95/545.03 = 217.91/x
  3. Step 3: Cross multiply
    394.95x = 545.03 × 217.91
  4. Step 4: Simplify right side
    394.95x = 118,770.26
  5. Step 5: Solve for x
    x = 118,770.26/394.95
  6. Step 6: Final answer
    x = 300.72

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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.