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Finding the Fourth Proportional to 15,764.70, 21,755.67 and 8,690.70

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Solution

The fourth proportional to 15,764.70, 21,755.67 and 8,690.70 is: 11,993.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,764.70 : 21,755.67 = 8,690.70 : x
  2. Step 2: Convert to fraction form
    15,764.70/21,755.67 = 8,690.70/x
  3. Step 3: Cross multiply
    15,764.70x = 21,755.67 × 8,690.70
  4. Step 4: Simplify right side
    15,764.70x = 189,072,001.27
  5. Step 5: Solve for x
    x = 189,072,001.27/15,764.70
  6. Step 6: Final answer
    x = 11,993.38

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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.