Home / 21,294.68-31,917.79-12,956.31

Finding the Fourth Proportional to 21,294.68, 31,917.79 and 12,956.31

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Solution

The fourth proportional to 21,294.68, 31,917.79 and 12,956.31 is: 19,419.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,294.68 : 31,917.79 = 12,956.31 : x
  2. Step 2: Convert to fraction form
    21,294.68/31,917.79 = 12,956.31/x
  3. Step 3: Cross multiply
    21,294.68x = 31,917.79 × 12,956.31
  4. Step 4: Simplify right side
    21,294.68x = 413,536,749.36
  5. Step 5: Solve for x
    x = 413,536,749.36/21,294.68
  6. Step 6: Final answer
    x = 19,419.73

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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.