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Finding the Fourth Proportional to 279.75, 419.58 and 198.35

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Solution

The fourth proportional to 279.75, 419.58 and 198.35 is: 297.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.75 : 419.58 = 198.35 : x
  2. Step 2: Convert to fraction form
    279.75/419.58 = 198.35/x
  3. Step 3: Cross multiply
    279.75x = 419.58 × 198.35
  4. Step 4: Simplify right side
    279.75x = 83,221.60
  5. Step 5: Solve for x
    x = 83,221.60/279.75
  6. Step 6: Final answer
    x = 297.49

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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.