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Finding the Fourth Proportional to 385.35, 578.30 and 154.30

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Solution

The fourth proportional to 385.35, 578.30 and 154.30 is: 231.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.35 : 578.30 = 154.30 : x
  2. Step 2: Convert to fraction form
    385.35/578.30 = 154.30/x
  3. Step 3: Cross multiply
    385.35x = 578.30 × 154.30
  4. Step 4: Simplify right side
    385.35x = 89,229.47
  5. Step 5: Solve for x
    x = 89,229.47/385.35
  6. Step 6: Final answer
    x = 231.56

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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.