Home / 15,111.91-20,856.90-8,399.71

Finding the Fourth Proportional to 15,111.91, 20,856.90 and 8,399.71

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Solution

The fourth proportional to 15,111.91, 20,856.90 and 8,399.71 is: 11,592.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,111.91 : 20,856.90 = 8,399.71 : x
  2. Step 2: Convert to fraction form
    15,111.91/20,856.90 = 8,399.71/x
  3. Step 3: Cross multiply
    15,111.91x = 20,856.90 × 8,399.71
  4. Step 4: Simplify right side
    15,111.91x = 175,191,911.50
  5. Step 5: Solve for x
    x = 175,191,911.50/15,111.91
  6. Step 6: Final answer
    x = 11,592.97

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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.