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Finding the Fourth Proportional to 2,728.85, 4,093.29 and 781.07

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Solution

The fourth proportional to 2,728.85, 4,093.29 and 781.07 is: 1,171.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,728.85 : 4,093.29 = 781.07 : x
  2. Step 2: Convert to fraction form
    2,728.85/4,093.29 = 781.07/x
  3. Step 3: Cross multiply
    2,728.85x = 4,093.29 × 781.07
  4. Step 4: Simplify right side
    2,728.85x = 3,197,146.02
  5. Step 5: Solve for x
    x = 3,197,146.02/2,728.85
  6. Step 6: Final answer
    x = 1,171.61

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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.