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Finding the Fourth Proportional to 15,927.73, 21,981.05 and 8,854

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Solution

The fourth proportional to 15,927.73, 21,981.05 and 8,854 is: 12,218.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,927.73 : 21,981.05 = 8,854 : x
  2. Step 2: Convert to fraction form
    15,927.73/21,981.05 = 8,854/x
  3. Step 3: Cross multiply
    15,927.73x = 21,981.05 × 8,854
  4. Step 4: Simplify right side
    15,927.73x = 194,620,216.70
  5. Step 5: Solve for x
    x = 194,620,216.70/15,927.73
  6. Step 6: Final answer
    x = 12,218.96

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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.