Home / 5,120.28-7,689.66-2,656.80

Finding the Fourth Proportional to 5,120.28, 7,689.66 and 2,656.80

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Solution

The fourth proportional to 5,120.28, 7,689.66 and 2,656.80 is: 3,989.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.28 : 7,689.66 = 2,656.80 : x
  2. Step 2: Convert to fraction form
    5,120.28/7,689.66 = 2,656.80/x
  3. Step 3: Cross multiply
    5,120.28x = 7,689.66 × 2,656.80
  4. Step 4: Simplify right side
    5,120.28x = 20,429,888.69
  5. Step 5: Solve for x
    x = 20,429,888.69/5,120.28
  6. Step 6: Final answer
    x = 3,989.99

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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.