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Finding the Fourth Proportional to 12,486.40, 18,729.60 and 11,910.40

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Solution

The fourth proportional to 12,486.40, 18,729.60 and 11,910.40 is: 17,865.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.40 : 18,729.60 = 11,910.40 : x
  2. Step 2: Convert to fraction form
    12,486.40/18,729.60 = 11,910.40/x
  3. Step 3: Cross multiply
    12,486.40x = 18,729.60 × 11,910.40
  4. Step 4: Simplify right side
    12,486.40x = 223,077,027.84
  5. Step 5: Solve for x
    x = 223,077,027.84/12,486.40
  6. Step 6: Final answer
    x = 17,865.60

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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.