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Finding the Fourth Proportional to 2,756.50, 4,134.90 and 808.90

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Solution

The fourth proportional to 2,756.50, 4,134.90 and 808.90 is: 1,213.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,756.50 : 4,134.90 = 808.90 : x
  2. Step 2: Convert to fraction form
    2,756.50/4,134.90 = 808.90/x
  3. Step 3: Cross multiply
    2,756.50x = 4,134.90 × 808.90
  4. Step 4: Simplify right side
    2,756.50x = 3,344,720.61
  5. Step 5: Solve for x
    x = 3,344,720.61/2,756.50
  6. Step 6: Final answer
    x = 1,213.39

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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.