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Finding the Fourth Proportional to 259.76, 389.28 and 198.96

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Solution

The fourth proportional to 259.76, 389.28 and 198.96 is: 298.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.76 : 389.28 = 198.96 : x
  2. Step 2: Convert to fraction form
    259.76/389.28 = 198.96/x
  3. Step 3: Cross multiply
    259.76x = 389.28 × 198.96
  4. Step 4: Simplify right side
    259.76x = 77,451.15
  5. Step 5: Solve for x
    x = 77,451.15/259.76
  6. Step 6: Final answer
    x = 298.16

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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.