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Finding the Fourth Proportional to 577.20, 865.68 and 212

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Solution

The fourth proportional to 577.20, 865.68 and 212 is: 317.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.20 : 865.68 = 212 : x
  2. Step 2: Convert to fraction form
    577.20/865.68 = 212/x
  3. Step 3: Cross multiply
    577.20x = 865.68 × 212
  4. Step 4: Simplify right side
    577.20x = 183,524.16
  5. Step 5: Solve for x
    x = 183,524.16/577.20
  6. Step 6: Final answer
    x = 317.96

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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.