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Finding the Fourth Proportional to 394.81, 545.20 and 296.39

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Solution

The fourth proportional to 394.81, 545.20 and 296.39 is: 409.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.81 : 545.20 = 296.39 : x
  2. Step 2: Convert to fraction form
    394.81/545.20 = 296.39/x
  3. Step 3: Cross multiply
    394.81x = 545.20 × 296.39
  4. Step 4: Simplify right side
    394.81x = 161,592.45
  5. Step 5: Solve for x
    x = 161,592.45/394.81
  6. Step 6: Final answer
    x = 409.29

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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.