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Finding the Fourth Proportional to 385.86, 578.78 and 111.94

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Solution

The fourth proportional to 385.86, 578.78 and 111.94 is: 167.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.86 : 578.78 = 111.94 : x
  2. Step 2: Convert to fraction form
    385.86/578.78 = 111.94/x
  3. Step 3: Cross multiply
    385.86x = 578.78 × 111.94
  4. Step 4: Simplify right side
    385.86x = 64,788.63
  5. Step 5: Solve for x
    x = 64,788.63/385.86
  6. Step 6: Final answer
    x = 167.91

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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.