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Finding the Fourth Proportional to 578.20, 866.72 and 212.89

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Solution

The fourth proportional to 578.20, 866.72 and 212.89 is: 319.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.20 : 866.72 = 212.89 : x
  2. Step 2: Convert to fraction form
    578.20/866.72 = 212.89/x
  3. Step 3: Cross multiply
    578.20x = 866.72 × 212.89
  4. Step 4: Simplify right side
    578.20x = 184,510.62
  5. Step 5: Solve for x
    x = 184,510.62/578.20
  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.