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Finding the Fourth Proportional to 2,991.78, 4,487.91 and 800.49

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Solution

The fourth proportional to 2,991.78, 4,487.91 and 800.49 is: 1,200.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.78 : 4,487.91 = 800.49 : x
  2. Step 2: Convert to fraction form
    2,991.78/4,487.91 = 800.49/x
  3. Step 3: Cross multiply
    2,991.78x = 4,487.91 × 800.49
  4. Step 4: Simplify right side
    2,991.78x = 3,592,527.08
  5. Step 5: Solve for x
    x = 3,592,527.08/2,991.78
  6. Step 6: Final answer
    x = 1,200.80

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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.