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Finding the Fourth Proportional to 398.75, 598.07 and 110.21

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Solution

The fourth proportional to 398.75, 598.07 and 110.21 is: 165.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.75 : 598.07 = 110.21 : x
  2. Step 2: Convert to fraction form
    398.75/598.07 = 110.21/x
  3. Step 3: Cross multiply
    398.75x = 598.07 × 110.21
  4. Step 4: Simplify right side
    398.75x = 65,909.75
  5. Step 5: Solve for x
    x = 65,909.75/398.75
  6. Step 6: Final answer
    x = 165.29

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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.