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Finding the Fourth Proportional to 444.78, 666.87 and 213.33

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Solution

The fourth proportional to 444.78, 666.87 and 213.33 is: 319.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    444.78 : 666.87 = 213.33 : x
  2. Step 2: Convert to fraction form
    444.78/666.87 = 213.33/x
  3. Step 3: Cross multiply
    444.78x = 666.87 × 213.33
  4. Step 4: Simplify right side
    444.78x = 142,263.38
  5. Step 5: Solve for x
    x = 142,263.38/444.78
  6. Step 6: Final answer
    x = 319.85

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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.