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Finding the Fourth Proportional to 20,956.52, 28,919.43 and 11,525.09

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Solution

The fourth proportional to 20,956.52, 28,919.43 and 11,525.09 is: 15,904.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,956.52 : 28,919.43 = 11,525.09 : x
  2. Step 2: Convert to fraction form
    20,956.52/28,919.43 = 11,525.09/x
  3. Step 3: Cross multiply
    20,956.52x = 28,919.43 × 11,525.09
  4. Step 4: Simplify right side
    20,956.52x = 333,298,888.90
  5. Step 5: Solve for x
    x = 333,298,888.90/20,956.52
  6. Step 6: Final answer
    x = 15,904.30

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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.