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Finding the Fourth Proportional to 8,640.90, 12,961.35 and 8,261.70

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Solution

The fourth proportional to 8,640.90, 12,961.35 and 8,261.70 is: 12,392.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640.90 : 12,961.35 = 8,261.70 : x
  2. Step 2: Convert to fraction form
    8,640.90/12,961.35 = 8,261.70/x
  3. Step 3: Cross multiply
    8,640.90x = 12,961.35 × 8,261.70
  4. Step 4: Simplify right side
    8,640.90x = 107,082,785.30
  5. Step 5: Solve for x
    x = 107,082,785.30/8,640.90
  6. Step 6: Final answer
    x = 12,392.55

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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.