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Finding the Fourth Proportional to 385.37, 578.10 and 111.47

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Solution

The fourth proportional to 385.37, 578.10 and 111.47 is: 167.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.37 : 578.10 = 111.47 : x
  2. Step 2: Convert to fraction form
    385.37/578.10 = 111.47/x
  3. Step 3: Cross multiply
    385.37x = 578.10 × 111.47
  4. Step 4: Simplify right side
    385.37x = 64,437.92
  5. Step 5: Solve for x
    x = 64,437.92/385.37
  6. Step 6: Final answer
    x = 167.21

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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.