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Finding the Fourth Proportional to 398.75, 598.33 and 155.21

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Solution

The fourth proportional to 398.75, 598.33 and 155.21 is: 232.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.75 : 598.33 = 155.21 : x
  2. Step 2: Convert to fraction form
    398.75/598.33 = 155.21/x
  3. Step 3: Cross multiply
    398.75x = 598.33 × 155.21
  4. Step 4: Simplify right side
    398.75x = 92,866.80
  5. Step 5: Solve for x
    x = 92,866.80/398.75
  6. Step 6: Final answer
    x = 232.89

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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.