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Finding the Fourth Proportional to 12,207.60, 18,311.40 and 4,415.40

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Solution

The fourth proportional to 12,207.60, 18,311.40 and 4,415.40 is: 6,623.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,207.60 : 18,311.40 = 4,415.40 : x
  2. Step 2: Convert to fraction form
    12,207.60/18,311.40 = 4,415.40/x
  3. Step 3: Cross multiply
    12,207.60x = 18,311.40 × 4,415.40
  4. Step 4: Simplify right side
    12,207.60x = 80,852,155.56
  5. Step 5: Solve for x
    x = 80,852,155.56/12,207.60
  6. Step 6: Final answer
    x = 6,623.10

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Half scale
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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.