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Finding the Fourth Proportional to 15,751.36, 21,738.10 and 8,679.04

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Solution

The fourth proportional to 15,751.36, 21,738.10 and 8,679.04 is: 11,977.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,751.36 : 21,738.10 = 8,679.04 : x
  2. Step 2: Convert to fraction form
    15,751.36/21,738.10 = 8,679.04/x
  3. Step 3: Cross multiply
    15,751.36x = 21,738.10 × 8,679.04
  4. Step 4: Simplify right side
    15,751.36x = 188,665,839.42
  5. Step 5: Solve for x
    x = 188,665,839.42/15,751.36
  6. Step 6: Final answer
    x = 11,977.75

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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.