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Finding the Fourth Proportional to 15,696.13, 21,659.85 and 8,621.20

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Solution

The fourth proportional to 15,696.13, 21,659.85 and 8,621.20 is: 11,896.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,696.13 : 21,659.85 = 8,621.20 : x
  2. Step 2: Convert to fraction form
    15,696.13/21,659.85 = 8,621.20/x
  3. Step 3: Cross multiply
    15,696.13x = 21,659.85 × 8,621.20
  4. Step 4: Simplify right side
    15,696.13x = 186,733,898.82
  5. Step 5: Solve for x
    x = 186,733,898.82/15,696.13
  6. Step 6: Final answer
    x = 11,896.81

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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.