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Finding the Fourth Proportional to 12,003.60, 18,005.40 and 7,640.40

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Solution

The fourth proportional to 12,003.60, 18,005.40 and 7,640.40 is: 11,460.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,003.60 : 18,005.40 = 7,640.40 : x
  2. Step 2: Convert to fraction form
    12,003.60/18,005.40 = 7,640.40/x
  3. Step 3: Cross multiply
    12,003.60x = 18,005.40 × 7,640.40
  4. Step 4: Simplify right side
    12,003.60x = 137,568,458.16
  5. Step 5: Solve for x
    x = 137,568,458.16/12,003.60
  6. Step 6: Final answer
    x = 11,460.60

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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.