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Finding the Fourth Proportional to 72,721.66, 109,082.49 and 20,131.12

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Solution

The fourth proportional to 72,721.66, 109,082.49 and 20,131.12 is: 30,196.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,721.66 : 109,082.49 = 20,131.12 : x
  2. Step 2: Convert to fraction form
    72,721.66/109,082.49 = 20,131.12/x
  3. Step 3: Cross multiply
    72,721.66x = 109,082.49 × 20,131.12
  4. Step 4: Simplify right side
    72,721.66x = 2,195,952,696.09
  5. Step 5: Solve for x
    x = 2,195,952,696.09/72,721.66
  6. Step 6: Final answer
    x = 30,196.68

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.