Home / 21,387.81-29,515.22-11,956.37

Finding the Fourth Proportional to 21,387.81, 29,515.22 and 11,956.37

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Solution

The fourth proportional to 21,387.81, 29,515.22 and 11,956.37 is: 16,499.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,387.81 : 29,515.22 = 11,956.37 : x
  2. Step 2: Convert to fraction form
    21,387.81/29,515.22 = 11,956.37/x
  3. Step 3: Cross multiply
    21,387.81x = 29,515.22 × 11,956.37
  4. Step 4: Simplify right side
    21,387.81x = 352,894,683.59
  5. Step 5: Solve for x
    x = 352,894,683.59/21,387.81
  6. Step 6: Final answer
    x = 16,499.80

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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.