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Finding the Fourth Proportional to 385.28, 531.24 and 352.52

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Solution

The fourth proportional to 385.28, 531.24 and 352.52 is: 486.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.28 : 531.24 = 352.52 : x
  2. Step 2: Convert to fraction form
    385.28/531.24 = 352.52/x
  3. Step 3: Cross multiply
    385.28x = 531.24 × 352.52
  4. Step 4: Simplify right side
    385.28x = 187,272.72
  5. Step 5: Solve for x
    x = 187,272.72/385.28
  6. Step 6: Final answer
    x = 486.07

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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.