Home / 13,112.76-18,090.46-8,638.86

Finding the Fourth Proportional to 13,112.76, 18,090.46 and 8,638.86

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Solution

The fourth proportional to 13,112.76, 18,090.46 and 8,638.86 is: 11,918.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,112.76 : 18,090.46 = 8,638.86 : x
  2. Step 2: Convert to fraction form
    13,112.76/18,090.46 = 8,638.86/x
  3. Step 3: Cross multiply
    13,112.76x = 18,090.46 × 8,638.86
  4. Step 4: Simplify right side
    13,112.76x = 156,280,951.28
  5. Step 5: Solve for x
    x = 156,280,951.28/13,112.76
  6. Step 6: Final answer
    x = 11,918.23

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Double scale
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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.