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Finding the Fourth Proportional to 15,791.50, 21,791.69 and 8,717.77

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Solution

The fourth proportional to 15,791.50, 21,791.69 and 8,717.77 is: 12,030.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,791.50 : 21,791.69 = 8,717.77 : x
  2. Step 2: Convert to fraction form
    15,791.50/21,791.69 = 8,717.77/x
  3. Step 3: Cross multiply
    15,791.50x = 21,791.69 × 8,717.77
  4. Step 4: Simplify right side
    15,791.50x = 189,974,788.78
  5. Step 5: Solve for x
    x = 189,974,788.78/15,791.50
  6. Step 6: Final answer
    x = 12,030.20

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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.