Home / 20,920.92-28,871.46-11,490.09

Finding the Fourth Proportional to 20,920.92, 28,871.46 and 11,490.09

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Solution

The fourth proportional to 20,920.92, 28,871.46 and 11,490.09 is: 15,856.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.92 : 28,871.46 = 11,490.09 : x
  2. Step 2: Convert to fraction form
    20,920.92/28,871.46 = 11,490.09/x
  3. Step 3: Cross multiply
    20,920.92x = 28,871.46 × 11,490.09
  4. Step 4: Simplify right side
    20,920.92x = 331,735,673.83
  5. Step 5: Solve for x
    x = 331,735,673.83/20,920.92
  6. Step 6: Final answer
    x = 15,856.65

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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.