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Finding the Fourth Proportional to 12,055.70, 18,069.57 and 7,129.49

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Solution

The fourth proportional to 12,055.70, 18,069.57 and 7,129.49 is: 10,685.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,055.70 : 18,069.57 = 7,129.49 : x
  2. Step 2: Convert to fraction form
    12,055.70/18,069.57 = 7,129.49/x
  3. Step 3: Cross multiply
    12,055.70x = 18,069.57 × 7,129.49
  4. Step 4: Simplify right side
    12,055.70x = 128,826,728.27
  5. Step 5: Solve for x
    x = 128,826,728.27/12,055.70
  6. Step 6: Final answer
    x = 10,685.96

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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.