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Finding the Fourth Proportional to 398.87, 598.31 and 124.95

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Solution

The fourth proportional to 398.87, 598.31 and 124.95 is: 187.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.87 : 598.31 = 124.95 : x
  2. Step 2: Convert to fraction form
    398.87/598.31 = 124.95/x
  3. Step 3: Cross multiply
    398.87x = 598.31 × 124.95
  4. Step 4: Simplify right side
    398.87x = 74,758.83
  5. Step 5: Solve for x
    x = 74,758.83/398.87
  6. Step 6: Final answer
    x = 187.43

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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.