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Finding the Fourth Proportional to 15,359.26, 21,195.86 and 8,645

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Solution

The fourth proportional to 15,359.26, 21,195.86 and 8,645 is: 11,930.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,359.26 : 21,195.86 = 8,645 : x
  2. Step 2: Convert to fraction form
    15,359.26/21,195.86 = 8,645/x
  3. Step 3: Cross multiply
    15,359.26x = 21,195.86 × 8,645
  4. Step 4: Simplify right side
    15,359.26x = 183,238,209.70
  5. Step 5: Solve for x
    x = 183,238,209.70/15,359.26
  6. Step 6: Final answer
    x = 11,930.15

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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.