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Finding the Fourth Proportional to 576.51, 865.22 and 211.65

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Solution

The fourth proportional to 576.51, 865.22 and 211.65 is: 317.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.51 : 865.22 = 211.65 : x
  2. Step 2: Convert to fraction form
    576.51/865.22 = 211.65/x
  3. Step 3: Cross multiply
    576.51x = 865.22 × 211.65
  4. Step 4: Simplify right side
    576.51x = 183,122.75
  5. Step 5: Solve for x
    x = 183,122.75/576.51
  6. Step 6: Final answer
    x = 317.64

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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.