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Finding the Fourth Proportional to 2,608.66, 3,912.99 and 878.50

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Solution

The fourth proportional to 2,608.66, 3,912.99 and 878.50 is: 1,317.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,608.66 : 3,912.99 = 878.50 : x
  2. Step 2: Convert to fraction form
    2,608.66/3,912.99 = 878.50/x
  3. Step 3: Cross multiply
    2,608.66x = 3,912.99 × 878.50
  4. Step 4: Simplify right side
    2,608.66x = 3,437,561.72
  5. Step 5: Solve for x
    x = 3,437,561.72/2,608.66
  6. Step 6: Final answer
    x = 1,317.75

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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.