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Finding the Fourth Proportional to 15,231, 21,021.66 and 8,607

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Solution

The fourth proportional to 15,231, 21,021.66 and 8,607 is: 11,879.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,231 : 21,021.66 = 8,607 : x
  2. Step 2: Convert to fraction form
    15,231/21,021.66 = 8,607/x
  3. Step 3: Cross multiply
    15,231x = 21,021.66 × 8,607
  4. Step 4: Simplify right side
    15,231x = 180,933,427.62
  5. Step 5: Solve for x
    x = 180,933,427.62/15,231
  6. Step 6: Final answer
    x = 11,879.29

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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.