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Finding the Fourth Proportional to 398.61, 597.78 and 155.22

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Solution

The fourth proportional to 398.61, 597.78 and 155.22 is: 232.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.61 : 597.78 = 155.22 : x
  2. Step 2: Convert to fraction form
    398.61/597.78 = 155.22/x
  3. Step 3: Cross multiply
    398.61x = 597.78 × 155.22
  4. Step 4: Simplify right side
    398.61x = 92,787.41
  5. Step 5: Solve for x
    x = 92,787.41/398.61
  6. Step 6: Final answer
    x = 232.78

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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.