Home / 21,299.05-29,397.70-13,238.79

Finding the Fourth Proportional to 21,299.05, 29,397.70 and 13,238.79

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Solution

The fourth proportional to 21,299.05, 29,397.70 and 13,238.79 is: 18,272.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,299.05 : 29,397.70 = 13,238.79 : x
  2. Step 2: Convert to fraction form
    21,299.05/29,397.70 = 13,238.79/x
  3. Step 3: Cross multiply
    21,299.05x = 29,397.70 × 13,238.79
  4. Step 4: Simplify right side
    21,299.05x = 389,189,973.98
  5. Step 5: Solve for x
    x = 389,189,973.98/21,299.05
  6. Step 6: Final answer
    x = 18,272.65

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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.