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Finding the Fourth Proportional to 39,136.80, 54,008.75 and 21,231.80

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Solution

The fourth proportional to 39,136.80, 54,008.75 and 21,231.80 is: 29,299.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,136.80 : 54,008.75 = 21,231.80 : x
  2. Step 2: Convert to fraction form
    39,136.80/54,008.75 = 21,231.80/x
  3. Step 3: Cross multiply
    39,136.80x = 54,008.75 × 21,231.80
  4. Step 4: Simplify right side
    39,136.80x = 1,146,703,007.11
  5. Step 5: Solve for x
    x = 1,146,703,007.11/39,136.80
  6. Step 6: Final answer
    x = 29,299.87

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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.