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Finding the Fourth Proportional to 458.98, 688.30 and 198.97

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Solution

The fourth proportional to 458.98, 688.30 and 198.97 is: 298.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.98 : 688.30 = 198.97 : x
  2. Step 2: Convert to fraction form
    458.98/688.30 = 198.97/x
  3. Step 3: Cross multiply
    458.98x = 688.30 × 198.97
  4. Step 4: Simplify right side
    458.98x = 136,951.05
  5. Step 5: Solve for x
    x = 136,951.05/458.98
  6. Step 6: Final answer
    x = 298.38

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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.