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Finding the Fourth Proportional to 15,691.90, 23,516.49 and 8,661.44

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Solution

The fourth proportional to 15,691.90, 23,516.49 and 8,661.44 is: 12,980.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,691.90 : 23,516.49 = 8,661.44 : x
  2. Step 2: Convert to fraction form
    15,691.90/23,516.49 = 8,661.44/x
  3. Step 3: Cross multiply
    15,691.90x = 23,516.49 × 8,661.44
  4. Step 4: Simplify right side
    15,691.90x = 203,686,667.15
  5. Step 5: Solve for x
    x = 203,686,667.15/15,691.90
  6. Step 6: Final answer
    x = 12,980.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.