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Finding the Fourth Proportional to 8,485.72, 12,728.60 and 2,640.76

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Solution

The fourth proportional to 8,485.72, 12,728.60 and 2,640.76 is: 3,961.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,485.72 : 12,728.60 = 2,640.76 : x
  2. Step 2: Convert to fraction form
    8,485.72/12,728.60 = 2,640.76/x
  3. Step 3: Cross multiply
    8,485.72x = 12,728.60 × 2,640.76
  4. Step 4: Simplify right side
    8,485.72x = 33,613,177.74
  5. Step 5: Solve for x
    x = 33,613,177.74/8,485.72
  6. Step 6: Final answer
    x = 3,961.15

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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.