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Finding the Fourth Proportional to 279.64, 419.05 and 198.51

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Solution

The fourth proportional to 279.64, 419.05 and 198.51 is: 297.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.64 : 419.05 = 198.51 : x
  2. Step 2: Convert to fraction form
    279.64/419.05 = 198.51/x
  3. Step 3: Cross multiply
    279.64x = 419.05 × 198.51
  4. Step 4: Simplify right side
    279.64x = 83,185.62
  5. Step 5: Solve for x
    x = 83,185.62/279.64
  6. Step 6: Final answer
    x = 297.47

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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.