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Finding the Fourth Proportional to 279.02, 420.02 and 198.44

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Solution

The fourth proportional to 279.02, 420.02 and 198.44 is: 298.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.02 : 420.02 = 198.44 : x
  2. Step 2: Convert to fraction form
    279.02/420.02 = 198.44/x
  3. Step 3: Cross multiply
    279.02x = 420.02 × 198.44
  4. Step 4: Simplify right side
    279.02x = 83,348.77
  5. Step 5: Solve for x
    x = 83,348.77/279.02
  6. Step 6: Final answer
    x = 298.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.