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Finding the Fourth Proportional to 15,791.49, 21,791.69 and 8,717.76

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Solution

The fourth proportional to 15,791.49, 21,791.69 and 8,717.76 is: 12,030.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,791.49 : 21,791.69 = 8,717.76 : x
  2. Step 2: Convert to fraction form
    15,791.49/21,791.69 = 8,717.76/x
  3. Step 3: Cross multiply
    15,791.49x = 21,791.69 × 8,717.76
  4. Step 4: Simplify right side
    15,791.49x = 189,974,723.41
  5. Step 5: Solve for x
    x = 189,974,723.41/15,791.49
  6. Step 6: Final answer
    x = 12,030.20

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1.5x scale

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.