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Finding the Fourth Proportional to 385.26, 576.76 and 247.90

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Solution

The fourth proportional to 385.26, 576.76 and 247.90 is: 371.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.26 : 576.76 = 247.90 : x
  2. Step 2: Convert to fraction form
    385.26/576.76 = 247.90/x
  3. Step 3: Cross multiply
    385.26x = 576.76 × 247.90
  4. Step 4: Simplify right side
    385.26x = 142,978.18
  5. Step 5: Solve for x
    x = 142,978.18/385.26
  6. Step 6: Final answer
    x = 371.12

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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.