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Finding the Fourth Proportional to 386.30, 532.89 and 261.96

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Solution

The fourth proportional to 386.30, 532.89 and 261.96 is: 361.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.30 : 532.89 = 261.96 : x
  2. Step 2: Convert to fraction form
    386.30/532.89 = 261.96/x
  3. Step 3: Cross multiply
    386.30x = 532.89 × 261.96
  4. Step 4: Simplify right side
    386.30x = 139,595.86
  5. Step 5: Solve for x
    x = 139,595.86/386.30
  6. Step 6: Final answer
    x = 361.37

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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.