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Finding the Fourth Proportional to 577.71, 866.38 and 212.42

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Solution

The fourth proportional to 577.71, 866.38 and 212.42 is: 318.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.71 : 866.38 = 212.42 : x
  2. Step 2: Convert to fraction form
    577.71/866.38 = 212.42/x
  3. Step 3: Cross multiply
    577.71x = 866.38 × 212.42
  4. Step 4: Simplify right side
    577.71x = 184,036.44
  5. Step 5: Solve for x
    x = 184,036.44/577.71
  6. Step 6: Final answer
    x = 318.56

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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.