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Finding the Fourth Proportional to 15,869.72, 21,900.32 and 9,155.63

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Solution

The fourth proportional to 15,869.72, 21,900.32 and 9,155.63 is: 12,634.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,869.72 : 21,900.32 = 9,155.63 : x
  2. Step 2: Convert to fraction form
    15,869.72/21,900.32 = 9,155.63/x
  3. Step 3: Cross multiply
    15,869.72x = 21,900.32 × 9,155.63
  4. Step 4: Simplify right side
    15,869.72x = 200,511,321.61
  5. Step 5: Solve for x
    x = 200,511,321.61/15,869.72
  6. Step 6: Final answer
    x = 12,634.83

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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.