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Finding the Fourth Proportional to 382.86, 574.09 and 261.16

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Solution

The fourth proportional to 382.86, 574.09 and 261.16 is: 391.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.86 : 574.09 = 261.16 : x
  2. Step 2: Convert to fraction form
    382.86/574.09 = 261.16/x
  3. Step 3: Cross multiply
    382.86x = 574.09 × 261.16
  4. Step 4: Simplify right side
    382.86x = 149,927.26
  5. Step 5: Solve for x
    x = 149,927.26/382.86
  6. Step 6: Final answer
    x = 391.60

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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.