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Finding the Fourth Proportional to 576.61, 864.96 and 211.40

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Solution

The fourth proportional to 576.61, 864.96 and 211.40 is: 317.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.61 : 864.96 = 211.40 : x
  2. Step 2: Convert to fraction form
    576.61/864.96 = 211.40/x
  3. Step 3: Cross multiply
    576.61x = 864.96 × 211.40
  4. Step 4: Simplify right side
    576.61x = 182,852.54
  5. Step 5: Solve for x
    x = 182,852.54/576.61
  6. Step 6: Final answer
    x = 317.12

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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.