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Finding the Fourth Proportional to 398.28, 594.01 and 391.80

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Solution

The fourth proportional to 398.28, 594.01 and 391.80 is: 584.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.28 : 594.01 = 391.80 : x
  2. Step 2: Convert to fraction form
    398.28/594.01 = 391.80/x
  3. Step 3: Cross multiply
    398.28x = 594.01 × 391.80
  4. Step 4: Simplify right side
    398.28x = 232,733.12
  5. Step 5: Solve for x
    x = 232,733.12/398.28
  6. Step 6: Final answer
    x = 584.35

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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.