Home / 20,919.06-28,856.25-12,530.70

Finding the Fourth Proportional to 20,919.06, 28,856.25 and 12,530.70

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Solution

The fourth proportional to 20,919.06, 28,856.25 and 12,530.70 is: 17,285.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.06 : 28,856.25 = 12,530.70 : x
  2. Step 2: Convert to fraction form
    20,919.06/28,856.25 = 12,530.70/x
  3. Step 3: Cross multiply
    20,919.06x = 28,856.25 × 12,530.70
  4. Step 4: Simplify right side
    20,919.06x = 361,589,011.88
  5. Step 5: Solve for x
    x = 361,589,011.88/20,919.06
  6. Step 6: Final answer
    x = 17,285.15

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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.