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Finding the Fourth Proportional to 409.36, 564.48 and 261.76

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Solution

The fourth proportional to 409.36, 564.48 and 261.76 is: 360.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.36 : 564.48 = 261.76 : x
  2. Step 2: Convert to fraction form
    409.36/564.48 = 261.76/x
  3. Step 3: Cross multiply
    409.36x = 564.48 × 261.76
  4. Step 4: Simplify right side
    409.36x = 147,758.28
  5. Step 5: Solve for x
    x = 147,758.28/409.36
  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.