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Finding the Fourth Proportional to 406.13, 609.18 and 261.95

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Solution

The fourth proportional to 406.13, 609.18 and 261.95 is: 392.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.13 : 609.18 = 261.95 : x
  2. Step 2: Convert to fraction form
    406.13/609.18 = 261.95/x
  3. Step 3: Cross multiply
    406.13x = 609.18 × 261.95
  4. Step 4: Simplify right side
    406.13x = 159,571.66
  5. Step 5: Solve for x
    x = 159,571.66/406.13
  6. Step 6: Final answer
    x = 392.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.