Home / 21,136.49-31,716.41-11,781.78

Finding the Fourth Proportional to 21,136.49, 31,716.41 and 11,781.78

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Solution

The fourth proportional to 21,136.49, 31,716.41 and 11,781.78 is: 17,679.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136.49 : 31,716.41 = 11,781.78 : x
  2. Step 2: Convert to fraction form
    21,136.49/31,716.41 = 11,781.78/x
  3. Step 3: Cross multiply
    21,136.49x = 31,716.41 × 11,781.78
  4. Step 4: Simplify right side
    21,136.49x = 373,675,742.64
  5. Step 5: Solve for x
    x = 373,675,742.64/21,136.49
  6. Step 6: Final answer
    x = 17,679.17

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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.