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Finding the Fourth Proportional to 385.27, 531.58 and 261.16

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Solution

The fourth proportional to 385.27, 531.58 and 261.16 is: 360.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.27 : 531.58 = 261.16 : x
  2. Step 2: Convert to fraction form
    385.27/531.58 = 261.16/x
  3. Step 3: Cross multiply
    385.27x = 531.58 × 261.16
  4. Step 4: Simplify right side
    385.27x = 138,824.12
  5. Step 5: Solve for x
    x = 138,824.12/385.27
  6. Step 6: Final answer
    x = 360.33

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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.