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Finding the Fourth Proportional to 385.39, 578.08 and 111.56

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Solution

The fourth proportional to 385.39, 578.08 and 111.56 is: 167.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.39 : 578.08 = 111.56 : x
  2. Step 2: Convert to fraction form
    385.39/578.08 = 111.56/x
  3. Step 3: Cross multiply
    385.39x = 578.08 × 111.56
  4. Step 4: Simplify right side
    385.39x = 64,490.60
  5. Step 5: Solve for x
    x = 64,490.60/385.39
  6. Step 6: Final answer
    x = 167.34

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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.