Home / 21,139.71-31,714.01-7,991.79

Finding the Fourth Proportional to 21,139.71, 31,714.01 and 7,991.79

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Solution

The fourth proportional to 21,139.71, 31,714.01 and 7,991.79 is: 11,989.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.71 : 31,714.01 = 7,991.79 : x
  2. Step 2: Convert to fraction form
    21,139.71/31,714.01 = 7,991.79/x
  3. Step 3: Cross multiply
    21,139.71x = 31,714.01 × 7,991.79
  4. Step 4: Simplify right side
    21,139.71x = 253,451,707.98
  5. Step 5: Solve for x
    x = 253,451,707.98/21,139.71
  6. Step 6: Final answer
    x = 11,989.37

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1.5x scale

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.