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Finding the Fourth Proportional to 398.91, 598.37 and 155.61

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Solution

The fourth proportional to 398.91, 598.37 and 155.61 is: 233.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.91 : 598.37 = 155.61 : x
  2. Step 2: Convert to fraction form
    398.91/598.37 = 155.61/x
  3. Step 3: Cross multiply
    398.91x = 598.37 × 155.61
  4. Step 4: Simplify right side
    398.91x = 93,112.36
  5. Step 5: Solve for x
    x = 93,112.36/398.91
  6. Step 6: Final answer
    x = 233.42

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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.