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Finding the Fourth Proportional to 259.98, 390.92 and 198.69

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Solution

The fourth proportional to 259.98, 390.92 and 198.69 is: 298.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.98 : 390.92 = 198.69 : x
  2. Step 2: Convert to fraction form
    259.98/390.92 = 198.69/x
  3. Step 3: Cross multiply
    259.98x = 390.92 × 198.69
  4. Step 4: Simplify right side
    259.98x = 77,670.90
  5. Step 5: Solve for x
    x = 77,670.90/259.98
  6. Step 6: Final answer
    x = 298.76

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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.