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Finding the Fourth Proportional to 12,486.72, 18,735.48 and 5,917.56

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Solution

The fourth proportional to 12,486.72, 18,735.48 and 5,917.56 is: 8,878.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.72 : 18,735.48 = 5,917.56 : x
  2. Step 2: Convert to fraction form
    12,486.72/18,735.48 = 5,917.56/x
  3. Step 3: Cross multiply
    12,486.72x = 18,735.48 × 5,917.56
  4. Step 4: Simplify right side
    12,486.72x = 110,868,327.03
  5. Step 5: Solve for x
    x = 110,868,327.03/12,486.72
  6. Step 6: Final answer
    x = 8,878.90

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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.