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Finding the Fourth Proportional to 15,753.72, 21,739.26 and 8,679.60

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Solution

The fourth proportional to 15,753.72, 21,739.26 and 8,679.60 is: 11,977.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,753.72 : 21,739.26 = 8,679.60 : x
  2. Step 2: Convert to fraction form
    15,753.72/21,739.26 = 8,679.60/x
  3. Step 3: Cross multiply
    15,753.72x = 21,739.26 × 8,679.60
  4. Step 4: Simplify right side
    15,753.72x = 188,688,081.10
  5. Step 5: Solve for x
    x = 188,688,081.10/15,753.72
  6. Step 6: Final answer
    x = 11,977.37

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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.