Home / 8,619.68-12,860.08-7,789.28

Finding the Fourth Proportional to 8,619.68, 12,860.08 and 7,789.28

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Solution

The fourth proportional to 8,619.68, 12,860.08 and 7,789.28 is: 11,621.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,619.68 : 12,860.08 = 7,789.28 : x
  2. Step 2: Convert to fraction form
    8,619.68/12,860.08 = 7,789.28/x
  3. Step 3: Cross multiply
    8,619.68x = 12,860.08 × 7,789.28
  4. Step 4: Simplify right side
    8,619.68x = 100,170,763.94
  5. Step 5: Solve for x
    x = 100,170,763.94/8,619.68
  6. Step 6: Final answer
    x = 11,621.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.