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Finding the Fourth Proportional to 15,221.00, 21,005.78 and 9,251.70

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Solution

The fourth proportional to 15,221.00, 21,005.78 and 9,251.70 is: 12,767.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,221.00 : 21,005.78 = 9,251.70 : x
  2. Step 2: Convert to fraction form
    15,221.00/21,005.78 = 9,251.70/x
  3. Step 3: Cross multiply
    15,221.00x = 21,005.78 × 9,251.70
  4. Step 4: Simplify right side
    15,221.00x = 194,339,128.57
  5. Step 5: Solve for x
    x = 194,339,128.57/15,221.00
  6. Step 6: Final answer
    x = 12,767.83

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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.