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Finding the Fourth Proportional to 385.45, 531.72 and 237.98

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Solution

The fourth proportional to 385.45, 531.72 and 237.98 is: 328.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.45 : 531.72 = 237.98 : x
  2. Step 2: Convert to fraction form
    385.45/531.72 = 237.98/x
  3. Step 3: Cross multiply
    385.45x = 531.72 × 237.98
  4. Step 4: Simplify right side
    385.45x = 126,540.05
  5. Step 5: Solve for x
    x = 126,540.05/385.45
  6. Step 6: Final answer
    x = 328.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.