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Finding the Fourth Proportional to 439.94, 656.42 and 398.90

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Solution

The fourth proportional to 439.94, 656.42 and 398.90 is: 595.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.94 : 656.42 = 398.90 : x
  2. Step 2: Convert to fraction form
    439.94/656.42 = 398.90/x
  3. Step 3: Cross multiply
    439.94x = 656.42 × 398.90
  4. Step 4: Simplify right side
    439.94x = 261,845.94
  5. Step 5: Solve for x
    x = 261,845.94/439.94
  6. Step 6: Final answer
    x = 595.19

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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.