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Finding the Fourth Proportional to 576.80, 865.20 and 211.60

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Solution

The fourth proportional to 576.80, 865.20 and 211.60 is: 317.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.80 : 865.20 = 211.60 : x
  2. Step 2: Convert to fraction form
    576.80/865.20 = 211.60/x
  3. Step 3: Cross multiply
    576.80x = 865.20 × 211.60
  4. Step 4: Simplify right side
    576.80x = 183,076.32
  5. Step 5: Solve for x
    x = 183,076.32/576.80
  6. Step 6: Final answer
    x = 317.40

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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.