Home / 21,126.92-31,695-7,979.36

Finding the Fourth Proportional to 21,126.92, 31,695 and 7,979.36

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Solution

The fourth proportional to 21,126.92, 31,695 and 7,979.36 is: 11,970.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,126.92 : 31,695 = 7,979.36 : x
  2. Step 2: Convert to fraction form
    21,126.92/31,695 = 7,979.36/x
  3. Step 3: Cross multiply
    21,126.92x = 31,695 × 7,979.36
  4. Step 4: Simplify right side
    21,126.92x = 252,905,815.20
  5. Step 5: Solve for x
    x = 252,905,815.20/21,126.92
  6. Step 6: Final answer
    x = 11,970.78

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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.