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Finding the Fourth Proportional to 609.87, 914.58 and 198.90

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Solution

The fourth proportional to 609.87, 914.58 and 198.90 is: 298.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.87 : 914.58 = 198.90 : x
  2. Step 2: Convert to fraction form
    609.87/914.58 = 198.90/x
  3. Step 3: Cross multiply
    609.87x = 914.58 × 198.90
  4. Step 4: Simplify right side
    609.87x = 181,909.96
  5. Step 5: Solve for x
    x = 181,909.96/609.87
  6. Step 6: Final answer
    x = 298.28

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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.