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Finding the Fourth Proportional to 398.79, 598.31 and 167.79

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Solution

The fourth proportional to 398.79, 598.31 and 167.79 is: 251.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.79 : 598.31 = 167.79 : x
  2. Step 2: Convert to fraction form
    398.79/598.31 = 167.79/x
  3. Step 3: Cross multiply
    398.79x = 598.31 × 167.79
  4. Step 4: Simplify right side
    398.79x = 100,389.60
  5. Step 5: Solve for x
    x = 100,389.60/398.79
  6. Step 6: Final answer
    x = 251.74

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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.