Home / 13,112.25-18,089.78-8,638.35

Finding the Fourth Proportional to 13,112.25, 18,089.78 and 8,638.35

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Solution

The fourth proportional to 13,112.25, 18,089.78 and 8,638.35 is: 11,917.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,112.25 : 18,089.78 = 8,638.35 : x
  2. Step 2: Convert to fraction form
    13,112.25/18,089.78 = 8,638.35/x
  3. Step 3: Cross multiply
    13,112.25x = 18,089.78 × 8,638.35
  4. Step 4: Simplify right side
    13,112.25x = 156,265,807.87
  5. Step 5: Solve for x
    x = 156,265,807.87/13,112.25
  6. Step 6: Final answer
    x = 11,917.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.