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Finding the Fourth Proportional to 577.80, 866.61 and 212.76

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Solution

The fourth proportional to 577.80, 866.61 and 212.76 is: 319.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.80 : 866.61 = 212.76 : x
  2. Step 2: Convert to fraction form
    577.80/866.61 = 212.76/x
  3. Step 3: Cross multiply
    577.80x = 866.61 × 212.76
  4. Step 4: Simplify right side
    577.80x = 184,379.94
  5. Step 5: Solve for x
    x = 184,379.94/577.80
  6. Step 6: Final answer
    x = 319.11

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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.