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Finding the Fourth Proportional to 279.64, 419.37 and 84.63

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Solution

The fourth proportional to 279.64, 419.37 and 84.63 is: 126.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.64 : 419.37 = 84.63 : x
  2. Step 2: Convert to fraction form
    279.64/419.37 = 84.63/x
  3. Step 3: Cross multiply
    279.64x = 419.37 × 84.63
  4. Step 4: Simplify right side
    279.64x = 35,491.28
  5. Step 5: Solve for x
    x = 35,491.28/279.64
  6. Step 6: Final answer
    x = 126.92

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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.