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Finding the Fourth Proportional to 15,731.62, 21,709.09 and 8,658.02

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Solution

The fourth proportional to 15,731.62, 21,709.09 and 8,658.02 is: 11,947.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,731.62 : 21,709.09 = 8,658.02 : x
  2. Step 2: Convert to fraction form
    15,731.62/21,709.09 = 8,658.02/x
  3. Step 3: Cross multiply
    15,731.62x = 21,709.09 × 8,658.02
  4. Step 4: Simplify right side
    15,731.62x = 187,957,735.40
  5. Step 5: Solve for x
    x = 187,957,735.40/15,731.62
  6. Step 6: Final answer
    x = 11,947.77

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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.