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Finding the Fourth Proportional to 385.62, 531.99 and 261.24

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Solution

The fourth proportional to 385.62, 531.99 and 261.24 is: 360.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.62 : 531.99 = 261.24 : x
  2. Step 2: Convert to fraction form
    385.62/531.99 = 261.24/x
  3. Step 3: Cross multiply
    385.62x = 531.99 × 261.24
  4. Step 4: Simplify right side
    385.62x = 138,977.07
  5. Step 5: Solve for x
    x = 138,977.07/385.62
  6. Step 6: Final answer
    x = 360.40

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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.