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Finding the Fourth Proportional to 385.87, 578.90 and 111.96

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Solution

The fourth proportional to 385.87, 578.90 and 111.96 is: 167.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.87 : 578.90 = 111.96 : x
  2. Step 2: Convert to fraction form
    385.87/578.90 = 111.96/x
  3. Step 3: Cross multiply
    385.87x = 578.90 × 111.96
  4. Step 4: Simplify right side
    385.87x = 64,810.91
  5. Step 5: Solve for x
    x = 64,810.91/385.87
  6. Step 6: Final answer
    x = 167.96

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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.