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Finding the Fourth Proportional to 408.90, 564.39 and 261.51

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Solution

The fourth proportional to 408.90, 564.39 and 261.51 is: 360.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.90 : 564.39 = 261.51 : x
  2. Step 2: Convert to fraction form
    408.90/564.39 = 261.51/x
  3. Step 3: Cross multiply
    408.90x = 564.39 × 261.51
  4. Step 4: Simplify right side
    408.90x = 147,593.63
  5. Step 5: Solve for x
    x = 147,593.63/408.90
  6. Step 6: Final answer
    x = 360.95

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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.