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Finding the Fourth Proportional to 15,745.92, 21,729.35 and 8,672.25

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Solution

The fourth proportional to 15,745.92, 21,729.35 and 8,672.25 is: 11,967.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,745.92 : 21,729.35 = 8,672.25 : x
  2. Step 2: Convert to fraction form
    15,745.92/21,729.35 = 8,672.25/x
  3. Step 3: Cross multiply
    15,745.92x = 21,729.35 × 8,672.25
  4. Step 4: Simplify right side
    15,745.92x = 188,442,312.18
  5. Step 5: Solve for x
    x = 188,442,312.18/15,745.92
  6. Step 6: Final answer
    x = 11,967.69

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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.