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Finding the Fourth Proportional to 2,757.80, 4,135.90 and 909.16

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Solution

The fourth proportional to 2,757.80, 4,135.90 and 909.16 is: 1,363.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,757.80 : 4,135.90 = 909.16 : x
  2. Step 2: Convert to fraction form
    2,757.80/4,135.90 = 909.16/x
  3. Step 3: Cross multiply
    2,757.80x = 4,135.90 × 909.16
  4. Step 4: Simplify right side
    2,757.80x = 3,760,194.84
  5. Step 5: Solve for x
    x = 3,760,194.84/2,757.80
  6. Step 6: Final answer
    x = 1,363.48

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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.