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Finding the Fourth Proportional to 394.76, 545.94 and 345.56

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Solution

The fourth proportional to 394.76, 545.94 and 345.56 is: 477.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.76 : 545.94 = 345.56 : x
  2. Step 2: Convert to fraction form
    394.76/545.94 = 345.56/x
  3. Step 3: Cross multiply
    394.76x = 545.94 × 345.56
  4. Step 4: Simplify right side
    394.76x = 188,652.30
  5. Step 5: Solve for x
    x = 188,652.30/394.76
  6. Step 6: Final answer
    x = 477.89

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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.