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Finding the Fourth Proportional to 2,605.70, 3,909.12 and 756.88

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Solution

The fourth proportional to 2,605.70, 3,909.12 and 756.88 is: 1,135.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,605.70 : 3,909.12 = 756.88 : x
  2. Step 2: Convert to fraction form
    2,605.70/3,909.12 = 756.88/x
  3. Step 3: Cross multiply
    2,605.70x = 3,909.12 × 756.88
  4. Step 4: Simplify right side
    2,605.70x = 2,958,734.75
  5. Step 5: Solve for x
    x = 2,958,734.75/2,605.70
  6. Step 6: Final answer
    x = 1,135.49

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1.5x scale

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.