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Finding the Fourth Proportional to 8,426.85, 12,640.28 and 8,426.85

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Solution

The fourth proportional to 8,426.85, 12,640.28 and 8,426.85 is: 12,640.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,426.85 : 12,640.28 = 8,426.85 : x
  2. Step 2: Convert to fraction form
    8,426.85/12,640.28 = 8,426.85/x
  3. Step 3: Cross multiply
    8,426.85x = 12,640.28 × 8,426.85
  4. Step 4: Simplify right side
    8,426.85x = 106,517,701.38
  5. Step 5: Solve for x
    x = 106,517,701.38/8,426.85
  6. Step 6: Final answer
    x = 12,640.28

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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.