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Finding the Fourth Proportional to 447.81, 617.89 and 261.25

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Solution

The fourth proportional to 447.81, 617.89 and 261.25 is: 360.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.81 : 617.89 = 261.25 : x
  2. Step 2: Convert to fraction form
    447.81/617.89 = 261.25/x
  3. Step 3: Cross multiply
    447.81x = 617.89 × 261.25
  4. Step 4: Simplify right side
    447.81x = 161,423.76
  5. Step 5: Solve for x
    x = 161,423.76/447.81
  6. Step 6: Final answer
    x = 360.47

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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.