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Finding the Fourth Proportional to 15,745.56, 21,729.78 and 8,672.10

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Solution

The fourth proportional to 15,745.56, 21,729.78 and 8,672.10 is: 11,968.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,745.56 : 21,729.78 = 8,672.10 : x
  2. Step 2: Convert to fraction form
    15,745.56/21,729.78 = 8,672.10/x
  3. Step 3: Cross multiply
    15,745.56x = 21,729.78 × 8,672.10
  4. Step 4: Simplify right side
    15,745.56x = 188,442,825.14
  5. Step 5: Solve for x
    x = 188,442,825.14/15,745.56
  6. Step 6: Final answer
    x = 11,968.00

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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.