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Finding the Fourth Proportional to 399.40, 550.86 and 294.43

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Solution

The fourth proportional to 399.40, 550.86 and 294.43 is: 406.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.40 : 550.86 = 294.43 : x
  2. Step 2: Convert to fraction form
    399.40/550.86 = 294.43/x
  3. Step 3: Cross multiply
    399.40x = 550.86 × 294.43
  4. Step 4: Simplify right side
    399.40x = 162,189.71
  5. Step 5: Solve for x
    x = 162,189.71/399.40
  6. Step 6: Final answer
    x = 406.08

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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.