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Finding the Fourth Proportional to 409.17, 564.30 and 261.57

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Solution

The fourth proportional to 409.17, 564.30 and 261.57 is: 360.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.17 : 564.30 = 261.57 : x
  2. Step 2: Convert to fraction form
    409.17/564.30 = 261.57/x
  3. Step 3: Cross multiply
    409.17x = 564.30 × 261.57
  4. Step 4: Simplify right side
    409.17x = 147,603.95
  5. Step 5: Solve for x
    x = 147,603.95/409.17
  6. Step 6: Final answer
    x = 360.74

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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.