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Finding the Fourth Proportional to 2,661.35, 3,990.30 and 1,274.65

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Solution

The fourth proportional to 2,661.35, 3,990.30 and 1,274.65 is: 1,911.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.35 : 3,990.30 = 1,274.65 : x
  2. Step 2: Convert to fraction form
    2,661.35/3,990.30 = 1,274.65/x
  3. Step 3: Cross multiply
    2,661.35x = 3,990.30 × 1,274.65
  4. Step 4: Simplify right side
    2,661.35x = 5,086,225.92
  5. Step 5: Solve for x
    x = 5,086,225.92/2,661.35
  6. Step 6: Final answer
    x = 1,911.15

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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.