Home / 20,856.92-28,789.56-12,680.46

Finding the Fourth Proportional to 20,856.92, 28,789.56 and 12,680.46

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Solution

The fourth proportional to 20,856.92, 28,789.56 and 12,680.46 is: 17,503.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.92 : 28,789.56 = 12,680.46 : x
  2. Step 2: Convert to fraction form
    20,856.92/28,789.56 = 12,680.46/x
  3. Step 3: Cross multiply
    20,856.92x = 28,789.56 × 12,680.46
  4. Step 4: Simplify right side
    20,856.92x = 365,064,864.00
  5. Step 5: Solve for x
    x = 365,064,864.00/20,856.92
  6. Step 6: Final answer
    x = 17,503.30

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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.