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Finding the Fourth Proportional to 3,891.72, 5,827.80 and 3,120.60

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Solution

The fourth proportional to 3,891.72, 5,827.80 and 3,120.60 is: 4,673.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.72 : 5,827.80 = 3,120.60 : x
  2. Step 2: Convert to fraction form
    3,891.72/5,827.80 = 3,120.60/x
  3. Step 3: Cross multiply
    3,891.72x = 5,827.80 × 3,120.60
  4. Step 4: Simplify right side
    3,891.72x = 18,186,232.68
  5. Step 5: Solve for x
    x = 18,186,232.68/3,891.72
  6. Step 6: Final answer
    x = 4,673.06

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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.