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Finding the Fourth Proportional to 394.62, 545.67 and 339.90

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Solution

The fourth proportional to 394.62, 545.67 and 339.90 is: 470.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.62 : 545.67 = 339.90 : x
  2. Step 2: Convert to fraction form
    394.62/545.67 = 339.90/x
  3. Step 3: Cross multiply
    394.62x = 545.67 × 339.90
  4. Step 4: Simplify right side
    394.62x = 185,473.23
  5. Step 5: Solve for x
    x = 185,473.23/394.62
  6. Step 6: Final answer
    x = 470.00

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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.