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Finding the Fourth Proportional to 5,129.76, 7,078.80 and 2,891.64

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Solution

The fourth proportional to 5,129.76, 7,078.80 and 2,891.64 is: 3,990.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.76 : 7,078.80 = 2,891.64 : x
  2. Step 2: Convert to fraction form
    5,129.76/7,078.80 = 2,891.64/x
  3. Step 3: Cross multiply
    5,129.76x = 7,078.80 × 2,891.64
  4. Step 4: Simplify right side
    5,129.76x = 20,469,341.23
  5. Step 5: Solve for x
    x = 20,469,341.23/5,129.76
  6. Step 6: Final answer
    x = 3,990.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.