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Finding the Fourth Proportional to 578.13, 866.67 and 212.66

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Solution

The fourth proportional to 578.13, 866.67 and 212.66 is: 318.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.13 : 866.67 = 212.66 : x
  2. Step 2: Convert to fraction form
    578.13/866.67 = 212.66/x
  3. Step 3: Cross multiply
    578.13x = 866.67 × 212.66
  4. Step 4: Simplify right side
    578.13x = 184,301.71
  5. Step 5: Solve for x
    x = 184,301.71/578.13
  6. Step 6: Final answer
    x = 318.79

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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.