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Finding the Fourth Proportional to 406.60, 608.96 and 261.88

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Solution

The fourth proportional to 406.60, 608.96 and 261.88 is: 392.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.60 : 608.96 = 261.88 : x
  2. Step 2: Convert to fraction form
    406.60/608.96 = 261.88/x
  3. Step 3: Cross multiply
    406.60x = 608.96 × 261.88
  4. Step 4: Simplify right side
    406.60x = 159,474.44
  5. Step 5: Solve for x
    x = 159,474.44/406.60
  6. Step 6: Final answer
    x = 392.21

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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.