Home / 21,711.40-29,956.88-13,217.96

Finding the Fourth Proportional to 21,711.40, 29,956.88 and 13,217.96

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Solution

The fourth proportional to 21,711.40, 29,956.88 and 13,217.96 is: 18,237.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,711.40 : 29,956.88 = 13,217.96 : x
  2. Step 2: Convert to fraction form
    21,711.40/29,956.88 = 13,217.96/x
  3. Step 3: Cross multiply
    21,711.40x = 29,956.88 × 13,217.96
  4. Step 4: Simplify right side
    21,711.40x = 395,968,841.56
  5. Step 5: Solve for x
    x = 395,968,841.56/21,711.40
  6. Step 6: Final answer
    x = 18,237.83

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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.