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Finding the Fourth Proportional to 12,079.80, 18,127.80 and 7,144.20

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Solution

The fourth proportional to 12,079.80, 18,127.80 and 7,144.20 is: 10,721.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,079.80 : 18,127.80 = 7,144.20 : x
  2. Step 2: Convert to fraction form
    12,079.80/18,127.80 = 7,144.20/x
  3. Step 3: Cross multiply
    12,079.80x = 18,127.80 × 7,144.20
  4. Step 4: Simplify right side
    12,079.80x = 129,508,628.76
  5. Step 5: Solve for x
    x = 129,508,628.76/12,079.80
  6. Step 6: Final answer
    x = 10,721.09

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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.