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Finding the Fourth Proportional to 576.51, 864.85 and 211.21

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Solution

The fourth proportional to 576.51, 864.85 and 211.21 is: 316.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.51 : 864.85 = 211.21 : x
  2. Step 2: Convert to fraction form
    576.51/864.85 = 211.21/x
  3. Step 3: Cross multiply
    576.51x = 864.85 × 211.21
  4. Step 4: Simplify right side
    576.51x = 182,659.59
  5. Step 5: Solve for x
    x = 182,659.59/576.51
  6. Step 6: Final answer
    x = 316.84

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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.