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Finding the Fourth Proportional to 8,420.80, 12,631.20 and 7,998.40

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Solution

The fourth proportional to 8,420.80, 12,631.20 and 7,998.40 is: 11,997.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,420.80 : 12,631.20 = 7,998.40 : x
  2. Step 2: Convert to fraction form
    8,420.80/12,631.20 = 7,998.40/x
  3. Step 3: Cross multiply
    8,420.80x = 12,631.20 × 7,998.40
  4. Step 4: Simplify right side
    8,420.80x = 101,029,390.08
  5. Step 5: Solve for x
    x = 101,029,390.08/8,420.80
  6. Step 6: Final answer
    x = 11,997.60

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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.