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Finding the Fourth Proportional to 15,326, 21,149.90 and 8,702

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Solution

The fourth proportional to 15,326, 21,149.90 and 8,702 is: 12,008.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,326 : 21,149.90 = 8,702 : x
  2. Step 2: Convert to fraction form
    15,326/21,149.90 = 8,702/x
  3. Step 3: Cross multiply
    15,326x = 21,149.90 × 8,702
  4. Step 4: Simplify right side
    15,326x = 184,046,429.80
  5. Step 5: Solve for x
    x = 184,046,429.80/15,326
  6. Step 6: Final answer
    x = 12,008.77

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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.