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Finding the Fourth Proportional to 20,808.54, 28,718.82 and 11,856.92

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Solution

The fourth proportional to 20,808.54, 28,718.82 and 11,856.92 is: 16,364.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.54 : 28,718.82 = 11,856.92 : x
  2. Step 2: Convert to fraction form
    20,808.54/28,718.82 = 11,856.92/x
  3. Step 3: Cross multiply
    20,808.54x = 28,718.82 × 11,856.92
  4. Step 4: Simplify right side
    20,808.54x = 340,516,607.64
  5. Step 5: Solve for x
    x = 340,516,607.64/20,808.54
  6. Step 6: Final answer
    x = 16,364.27

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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.