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Finding the Fourth Proportional to 398.67, 597.91 and 142.17

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Solution

The fourth proportional to 398.67, 597.91 and 142.17 is: 213.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.67 : 597.91 = 142.17 : x
  2. Step 2: Convert to fraction form
    398.67/597.91 = 142.17/x
  3. Step 3: Cross multiply
    398.67x = 597.91 × 142.17
  4. Step 4: Simplify right side
    398.67x = 85,004.86
  5. Step 5: Solve for x
    x = 85,004.86/398.67
  6. Step 6: Final answer
    x = 213.22

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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.