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Finding the Fourth Proportional to 398.90, 597.12 and 215.84

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Solution

The fourth proportional to 398.90, 597.12 and 215.84 is: 323.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.90 : 597.12 = 215.84 : x
  2. Step 2: Convert to fraction form
    398.90/597.12 = 215.84/x
  3. Step 3: Cross multiply
    398.90x = 597.12 × 215.84
  4. Step 4: Simplify right side
    398.90x = 128,882.38
  5. Step 5: Solve for x
    x = 128,882.38/398.90
  6. Step 6: Final answer
    x = 323.09

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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.