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Finding the Fourth Proportional to 2,611.46, 3,917.21 and 663.66

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Solution

The fourth proportional to 2,611.46, 3,917.21 and 663.66 is: 995.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,611.46 : 3,917.21 = 663.66 : x
  2. Step 2: Convert to fraction form
    2,611.46/3,917.21 = 663.66/x
  3. Step 3: Cross multiply
    2,611.46x = 3,917.21 × 663.66
  4. Step 4: Simplify right side
    2,611.46x = 2,599,695.59
  5. Step 5: Solve for x
    x = 2,599,695.59/2,611.46
  6. Step 6: Final answer
    x = 995.50

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Double scale
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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.