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Finding the Fourth Proportional to 322.79, 484.85 and 261.16

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Solution

The fourth proportional to 322.79, 484.85 and 261.16 is: 392.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.79 : 484.85 = 261.16 : x
  2. Step 2: Convert to fraction form
    322.79/484.85 = 261.16/x
  3. Step 3: Cross multiply
    322.79x = 484.85 × 261.16
  4. Step 4: Simplify right side
    322.79x = 126,620.91
  5. Step 5: Solve for x
    x = 126,620.91/322.79
  6. Step 6: Final answer
    x = 392.28

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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.