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Finding the Fourth Proportional to 385.29, 578.02 and 111.39

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Solution

The fourth proportional to 385.29, 578.02 and 111.39 is: 167.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.29 : 578.02 = 111.39 : x
  2. Step 2: Convert to fraction form
    385.29/578.02 = 111.39/x
  3. Step 3: Cross multiply
    385.29x = 578.02 × 111.39
  4. Step 4: Simplify right side
    385.29x = 64,383.04
  5. Step 5: Solve for x
    x = 64,383.04/385.29
  6. Step 6: Final answer
    x = 167.10

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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.