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Finding the Fourth Proportional to 279.57, 419.33 and 218.55

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Solution

The fourth proportional to 279.57, 419.33 and 218.55 is: 327.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.57 : 419.33 = 218.55 : x
  2. Step 2: Convert to fraction form
    279.57/419.33 = 218.55/x
  3. Step 3: Cross multiply
    279.57x = 419.33 × 218.55
  4. Step 4: Simplify right side
    279.57x = 91,643.48
  5. Step 5: Solve for x
    x = 91,643.48/279.57
  6. Step 6: Final answer
    x = 327.80

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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.