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Finding the Fourth Proportional to 15,696.50, 21,661.20 and 8,622.86

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Solution

The fourth proportional to 15,696.50, 21,661.20 and 8,622.86 is: 11,899.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,696.50 : 21,661.20 = 8,622.86 : x
  2. Step 2: Convert to fraction form
    15,696.50/21,661.20 = 8,622.86/x
  3. Step 3: Cross multiply
    15,696.50x = 21,661.20 × 8,622.86
  4. Step 4: Simplify right side
    15,696.50x = 186,781,386.73
  5. Step 5: Solve for x
    x = 186,781,386.73/15,696.50
  6. Step 6: Final answer
    x = 11,899.56

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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.