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Finding the Fourth Proportional to 20,687.68, 28,548.84 and 11,256.22

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Solution

The fourth proportional to 20,687.68, 28,548.84 and 11,256.22 is: 15,533.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.68 : 28,548.84 = 11,256.22 : x
  2. Step 2: Convert to fraction form
    20,687.68/28,548.84 = 11,256.22/x
  3. Step 3: Cross multiply
    20,687.68x = 28,548.84 × 11,256.22
  4. Step 4: Simplify right side
    20,687.68x = 321,352,023.78
  5. Step 5: Solve for x
    x = 321,352,023.78/20,687.68
  6. Step 6: Final answer
    x = 15,533.50

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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.