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Finding the Fourth Proportional to 13,068.90, 18,039.21 and 8,353.20

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Solution

The fourth proportional to 13,068.90, 18,039.21 and 8,353.20 is: 11,530.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,068.90 : 18,039.21 = 8,353.20 : x
  2. Step 2: Convert to fraction form
    13,068.90/18,039.21 = 8,353.20/x
  3. Step 3: Cross multiply
    13,068.90x = 18,039.21 × 8,353.20
  4. Step 4: Simplify right side
    13,068.90x = 150,685,128.97
  5. Step 5: Solve for x
    x = 150,685,128.97/13,068.90
  6. Step 6: Final answer
    x = 11,530.05

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Double scale
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Similar ratio
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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.