Home / 20,856.61-28,784.19-11,905.46

Finding the Fourth Proportional to 20,856.61, 28,784.19 and 11,905.46

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Solution

The fourth proportional to 20,856.61, 28,784.19 and 11,905.46 is: 16,430.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.61 : 28,784.19 = 11,905.46 : x
  2. Step 2: Convert to fraction form
    20,856.61/28,784.19 = 11,905.46/x
  3. Step 3: Cross multiply
    20,856.61x = 28,784.19 × 11,905.46
  4. Step 4: Simplify right side
    20,856.61x = 342,688,910.65
  5. Step 5: Solve for x
    x = 342,688,910.65/20,856.61
  6. Step 6: Final answer
    x = 16,430.71

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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.