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Finding the Fourth Proportional to 15,764.80, 21,755.68 and 8,691.12

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Solution

The fourth proportional to 15,764.80, 21,755.68 and 8,691.12 is: 11,993.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,764.80 : 21,755.68 = 8,691.12 : x
  2. Step 2: Convert to fraction form
    15,764.80/21,755.68 = 8,691.12/x
  3. Step 3: Cross multiply
    15,764.80x = 21,755.68 × 8,691.12
  4. Step 4: Simplify right side
    15,764.80x = 189,081,225.56
  5. Step 5: Solve for x
    x = 189,081,225.56/15,764.80
  6. Step 6: Final answer
    x = 11,993.89

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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.