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Finding the Fourth Proportional to 279.59, 419.40 and 84.60

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Solution

The fourth proportional to 279.59, 419.40 and 84.60 is: 126.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.59 : 419.40 = 84.60 : x
  2. Step 2: Convert to fraction form
    279.59/419.40 = 84.60/x
  3. Step 3: Cross multiply
    279.59x = 419.40 × 84.60
  4. Step 4: Simplify right side
    279.59x = 35,481.24
  5. Step 5: Solve for x
    x = 35,481.24/279.59
  6. Step 6: Final answer
    x = 126.91

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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.