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Finding the Fourth Proportional to 2,640.75, 3,961.53 and 909.78

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Solution

The fourth proportional to 2,640.75, 3,961.53 and 909.78 is: 1,364.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.75 : 3,961.53 = 909.78 : x
  2. Step 2: Convert to fraction form
    2,640.75/3,961.53 = 909.78/x
  3. Step 3: Cross multiply
    2,640.75x = 3,961.53 × 909.78
  4. Step 4: Simplify right side
    2,640.75x = 3,604,120.76
  5. Step 5: Solve for x
    x = 3,604,120.76/2,640.75
  6. Step 6: Final answer
    x = 1,364.81

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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.