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Finding the Fourth Proportional to 398.45, 597.31 and 154.80

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Solution

The fourth proportional to 398.45, 597.31 and 154.80 is: 232.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.45 : 597.31 = 154.80 : x
  2. Step 2: Convert to fraction form
    398.45/597.31 = 154.80/x
  3. Step 3: Cross multiply
    398.45x = 597.31 × 154.80
  4. Step 4: Simplify right side
    398.45x = 92,463.20
  5. Step 5: Solve for x
    x = 92,463.20/398.45
  6. Step 6: Final answer
    x = 232.06

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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.