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Finding the Fourth Proportional to 20,808.78, 28,718.76 and 11,859.50

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Solution

The fourth proportional to 20,808.78, 28,718.76 and 11,859.50 is: 16,367.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.78 : 28,718.76 = 11,859.50 : x
  2. Step 2: Convert to fraction form
    20,808.78/28,718.76 = 11,859.50/x
  3. Step 3: Cross multiply
    20,808.78x = 28,718.76 × 11,859.50
  4. Step 4: Simplify right side
    20,808.78x = 340,590,134.22
  5. Step 5: Solve for x
    x = 340,590,134.22/20,808.78
  6. Step 6: Final answer
    x = 16,367.62

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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.