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Finding the Fourth Proportional to 405.49, 608.24 and 261.31

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Solution

The fourth proportional to 405.49, 608.24 and 261.31 is: 391.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.49 : 608.24 = 261.31 : x
  2. Step 2: Convert to fraction form
    405.49/608.24 = 261.31/x
  3. Step 3: Cross multiply
    405.49x = 608.24 × 261.31
  4. Step 4: Simplify right side
    405.49x = 158,939.19
  5. Step 5: Solve for x
    x = 158,939.19/405.49
  6. Step 6: Final answer
    x = 391.97

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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.