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Finding the Fourth Proportional to 577.78, 866.57 and 212.47

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Solution

The fourth proportional to 577.78, 866.57 and 212.47 is: 318.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.78 : 866.57 = 212.47 : x
  2. Step 2: Convert to fraction form
    577.78/866.57 = 212.47/x
  3. Step 3: Cross multiply
    577.78x = 866.57 × 212.47
  4. Step 4: Simplify right side
    577.78x = 184,116.90
  5. Step 5: Solve for x
    x = 184,116.90/577.78
  6. Step 6: Final answer
    x = 318.66

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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.