Home / 21,139.20-31,708.80-10,771.20

Finding the Fourth Proportional to 21,139.20, 31,708.80 and 10,771.20

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Solution

The fourth proportional to 21,139.20, 31,708.80 and 10,771.20 is: 16,156.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.20 : 31,708.80 = 10,771.20 : x
  2. Step 2: Convert to fraction form
    21,139.20/31,708.80 = 10,771.20/x
  3. Step 3: Cross multiply
    21,139.20x = 31,708.80 × 10,771.20
  4. Step 4: Simplify right side
    21,139.20x = 341,541,826.56
  5. Step 5: Solve for x
    x = 341,541,826.56/21,139.20
  6. Step 6: Final answer
    x = 16,156.80

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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.