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Finding the Fourth Proportional to 2,607.12, 3,909.80 and 757.76

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Solution

The fourth proportional to 2,607.12, 3,909.80 and 757.76 is: 1,136.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,607.12 : 3,909.80 = 757.76 : x
  2. Step 2: Convert to fraction form
    2,607.12/3,909.80 = 757.76/x
  3. Step 3: Cross multiply
    2,607.12x = 3,909.80 × 757.76
  4. Step 4: Simplify right side
    2,607.12x = 2,962,690.05
  5. Step 5: Solve for x
    x = 2,962,690.05/2,607.12
  6. Step 6: Final answer
    x = 1,136.38

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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.