Home / 12,074.80-18,120.30-7,139.20

Finding the Fourth Proportional to 12,074.80, 18,120.30 and 7,139.20

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Solution

The fourth proportional to 12,074.80, 18,120.30 and 7,139.20 is: 10,713.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,074.80 : 18,120.30 = 7,139.20 : x
  2. Step 2: Convert to fraction form
    12,074.80/18,120.30 = 7,139.20/x
  3. Step 3: Cross multiply
    12,074.80x = 18,120.30 × 7,139.20
  4. Step 4: Simplify right side
    12,074.80x = 129,364,445.76
  5. Step 5: Solve for x
    x = 129,364,445.76/12,074.80
  6. Step 6: Final answer
    x = 10,713.59

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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.