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Finding the Fourth Proportional to 13,410.10, 20,115.15 and 8,485.30

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Solution

The fourth proportional to 13,410.10, 20,115.15 and 8,485.30 is: 12,727.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,410.10 : 20,115.15 = 8,485.30 : x
  2. Step 2: Convert to fraction form
    13,410.10/20,115.15 = 8,485.30/x
  3. Step 3: Cross multiply
    13,410.10x = 20,115.15 × 8,485.30
  4. Step 4: Simplify right side
    13,410.10x = 170,683,082.30
  5. Step 5: Solve for x
    x = 170,683,082.30/13,410.10
  6. Step 6: Final answer
    x = 12,727.95

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.