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Finding the Fourth Proportional to 12,391.73, 18,581.54 and 8,645.31

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Solution

The fourth proportional to 12,391.73, 18,581.54 and 8,645.31 is: 12,963.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,391.73 : 18,581.54 = 8,645.31 : x
  2. Step 2: Convert to fraction form
    12,391.73/18,581.54 = 8,645.31/x
  3. Step 3: Cross multiply
    12,391.73x = 18,581.54 × 8,645.31
  4. Step 4: Simplify right side
    12,391.73x = 160,643,130.35
  5. Step 5: Solve for x
    x = 160,643,130.35/12,391.73
  6. Step 6: Final answer
    x = 12,963.74

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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.