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Finding the Fourth Proportional to 398.80, 598.21 and 124.89

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Solution

The fourth proportional to 398.80, 598.21 and 124.89 is: 187.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.80 : 598.21 = 124.89 : x
  2. Step 2: Convert to fraction form
    398.80/598.21 = 124.89/x
  3. Step 3: Cross multiply
    398.80x = 598.21 × 124.89
  4. Step 4: Simplify right side
    398.80x = 74,708.73
  5. Step 5: Solve for x
    x = 74,708.73/398.80
  6. Step 6: Final answer
    x = 187.33

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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.