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Finding the Fourth Proportional to 399.44, 594.10 and 394.40

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Solution

The fourth proportional to 399.44, 594.10 and 394.40 is: 586.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.44 : 594.10 = 394.40 : x
  2. Step 2: Convert to fraction form
    399.44/594.10 = 394.40/x
  3. Step 3: Cross multiply
    399.44x = 594.10 × 394.40
  4. Step 4: Simplify right side
    399.44x = 234,313.04
  5. Step 5: Solve for x
    x = 234,313.04/399.44
  6. Step 6: Final answer
    x = 586.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.