Home / 21,633.72-29,872.74-13,689.96

Finding the Fourth Proportional to 21,633.72, 29,872.74 and 13,689.96

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Solution

The fourth proportional to 21,633.72, 29,872.74 and 13,689.96 is: 18,903.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,633.72 : 29,872.74 = 13,689.96 : x
  2. Step 2: Convert to fraction form
    21,633.72/29,872.74 = 13,689.96/x
  3. Step 3: Cross multiply
    21,633.72x = 29,872.74 × 13,689.96
  4. Step 4: Simplify right side
    21,633.72x = 408,956,615.69
  5. Step 5: Solve for x
    x = 408,956,615.69/21,633.72
  6. Step 6: Final answer
    x = 18,903.67

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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.