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Finding the Fourth Proportional to 279.89, 419.60 and 218.84

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Solution

The fourth proportional to 279.89, 419.60 and 218.84 is: 328.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.89 : 419.60 = 218.84 : x
  2. Step 2: Convert to fraction form
    279.89/419.60 = 218.84/x
  3. Step 3: Cross multiply
    279.89x = 419.60 × 218.84
  4. Step 4: Simplify right side
    279.89x = 91,822.07
  5. Step 5: Solve for x
    x = 91,822.07/279.89
  6. Step 6: Final answer
    x = 328.07

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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.