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Finding the Fourth Proportional to 12,360.40, 18,540.60 and 7,111.60

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Solution

The fourth proportional to 12,360.40, 18,540.60 and 7,111.60 is: 10,667.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,360.40 : 18,540.60 = 7,111.60 : x
  2. Step 2: Convert to fraction form
    12,360.40/18,540.60 = 7,111.60/x
  3. Step 3: Cross multiply
    12,360.40x = 18,540.60 × 7,111.60
  4. Step 4: Simplify right side
    12,360.40x = 131,853,330.96
  5. Step 5: Solve for x
    x = 131,853,330.96/12,360.40
  6. Step 6: Final answer
    x = 10,667.40

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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.