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Finding the Fourth Proportional to 13,119.50, 18,099.78 and 8,645.60

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Solution

The fourth proportional to 13,119.50, 18,099.78 and 8,645.60 is: 11,927.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,119.50 : 18,099.78 = 8,645.60 : x
  2. Step 2: Convert to fraction form
    13,119.50/18,099.78 = 8,645.60/x
  3. Step 3: Cross multiply
    13,119.50x = 18,099.78 × 8,645.60
  4. Step 4: Simplify right side
    13,119.50x = 156,483,457.97
  5. Step 5: Solve for x
    x = 156,483,457.97/13,119.50
  6. Step 6: Final answer
    x = 11,927.55

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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.