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Finding the Fourth Proportional to 398.25, 597.11 and 319.95

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Solution

The fourth proportional to 398.25, 597.11 and 319.95 is: 479.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.25 : 597.11 = 319.95 : x
  2. Step 2: Convert to fraction form
    398.25/597.11 = 319.95/x
  3. Step 3: Cross multiply
    398.25x = 597.11 × 319.95
  4. Step 4: Simplify right side
    398.25x = 191,043.74
  5. Step 5: Solve for x
    x = 191,043.74/398.25
  6. Step 6: Final answer
    x = 479.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.