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Finding the Fourth Proportional to 15,805.79, 21,811.97 and 9,091.24

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Solution

The fourth proportional to 15,805.79, 21,811.97 and 9,091.24 is: 12,545.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.79 : 21,811.97 = 9,091.24 : x
  2. Step 2: Convert to fraction form
    15,805.79/21,811.97 = 9,091.24/x
  3. Step 3: Cross multiply
    15,805.79x = 21,811.97 × 9,091.24
  4. Step 4: Simplify right side
    15,805.79x = 198,297,854.14
  5. Step 5: Solve for x
    x = 198,297,854.14/15,805.79
  6. Step 6: Final answer
    x = 12,545.90

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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.