Home / 5,129.50-7,078.70-2,891.28

Finding the Fourth Proportional to 5,129.50, 7,078.70 and 2,891.28

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Solution

The fourth proportional to 5,129.50, 7,078.70 and 2,891.28 is: 3,989.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.50 : 7,078.70 = 2,891.28 : x
  2. Step 2: Convert to fraction form
    5,129.50/7,078.70 = 2,891.28/x
  3. Step 3: Cross multiply
    5,129.50x = 7,078.70 × 2,891.28
  4. Step 4: Simplify right side
    5,129.50x = 20,466,503.74
  5. Step 5: Solve for x
    x = 20,466,503.74/5,129.50
  6. Step 6: Final answer
    x = 3,989.96

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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.