Home / 21,012.75-31,519.40-7,161.75

Finding the Fourth Proportional to 21,012.75, 31,519.40 and 7,161.75

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Solution

The fourth proportional to 21,012.75, 31,519.40 and 7,161.75 is: 10,742.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.75 : 31,519.40 = 7,161.75 : x
  2. Step 2: Convert to fraction form
    21,012.75/31,519.40 = 7,161.75/x
  3. Step 3: Cross multiply
    21,012.75x = 31,519.40 × 7,161.75
  4. Step 4: Simplify right side
    21,012.75x = 225,734,027.14
  5. Step 5: Solve for x
    x = 225,734,027.14/21,012.75
  6. Step 6: Final answer
    x = 10,742.72

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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.