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Finding the Fourth Proportional to 398.76, 598.42 and 142.26

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Solution

The fourth proportional to 398.76, 598.42 and 142.26 is: 213.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.76 : 598.42 = 142.26 : x
  2. Step 2: Convert to fraction form
    398.76/598.42 = 142.26/x
  3. Step 3: Cross multiply
    398.76x = 598.42 × 142.26
  4. Step 4: Simplify right side
    398.76x = 85,131.23
  5. Step 5: Solve for x
    x = 85,131.23/398.76
  6. Step 6: Final answer
    x = 213.49

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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.