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Finding the Fourth Proportional to 15,757.42, 21,745.71 and 8,684.30

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Solution

The fourth proportional to 15,757.42, 21,745.71 and 8,684.30 is: 11,984.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,757.42 : 21,745.71 = 8,684.30 : x
  2. Step 2: Convert to fraction form
    15,757.42/21,745.71 = 8,684.30/x
  3. Step 3: Cross multiply
    15,757.42x = 21,745.71 × 8,684.30
  4. Step 4: Simplify right side
    15,757.42x = 188,846,269.35
  5. Step 5: Solve for x
    x = 188,846,269.35/15,757.42
  6. Step 6: Final answer
    x = 11,984.59

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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.