Home / 21,139.60-31,680.24-15,939.76

Finding the Fourth Proportional to 21,139.60, 31,680.24 and 15,939.76

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Solution

The fourth proportional to 21,139.60, 31,680.24 and 15,939.76 is: 23,887.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.60 : 31,680.24 = 15,939.76 : x
  2. Step 2: Convert to fraction form
    21,139.60/31,680.24 = 15,939.76/x
  3. Step 3: Cross multiply
    21,139.60x = 31,680.24 × 15,939.76
  4. Step 4: Simplify right side
    21,139.60x = 504,975,422.34
  5. Step 5: Solve for x
    x = 504,975,422.34/21,139.60
  6. Step 6: Final answer
    x = 23,887.65

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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.