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Finding the Fourth Proportional to 20,876.63, 28,811.56 and 11,447.01

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Solution

The fourth proportional to 20,876.63, 28,811.56 and 11,447.01 is: 15,797.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.63 : 28,811.56 = 11,447.01 : x
  2. Step 2: Convert to fraction form
    20,876.63/28,811.56 = 11,447.01/x
  3. Step 3: Cross multiply
    20,876.63x = 28,811.56 × 11,447.01
  4. Step 4: Simplify right side
    20,876.63x = 329,806,222.83
  5. Step 5: Solve for x
    x = 329,806,222.83/20,876.63
  6. Step 6: Final answer
    x = 15,797.87

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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.