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Finding the Fourth Proportional to 12,069.80, 18,112.80 and 7,134.20

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Solution

The fourth proportional to 12,069.80, 18,112.80 and 7,134.20 is: 10,706.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,069.80 : 18,112.80 = 7,134.20 : x
  2. Step 2: Convert to fraction form
    12,069.80/18,112.80 = 7,134.20/x
  3. Step 3: Cross multiply
    12,069.80x = 18,112.80 × 7,134.20
  4. Step 4: Simplify right side
    12,069.80x = 129,220,337.76
  5. Step 5: Solve for x
    x = 129,220,337.76/12,069.80
  6. Step 6: Final answer
    x = 10,706.09

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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.