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Finding the Fourth Proportional to 72,136.20, 108,131.40 and 32,721.60

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Solution

The fourth proportional to 72,136.20, 108,131.40 and 32,721.60 is: 49,049.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,136.20 : 108,131.40 = 32,721.60 : x
  2. Step 2: Convert to fraction form
    72,136.20/108,131.40 = 32,721.60/x
  3. Step 3: Cross multiply
    72,136.20x = 108,131.40 × 32,721.60
  4. Step 4: Simplify right side
    72,136.20x = 3,538,232,418.24
  5. Step 5: Solve for x
    x = 3,538,232,418.24/72,136.20
  6. Step 6: Final answer
    x = 49,049.33

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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.