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Finding the Fourth Proportional to 2,660.08, 3,990.63 and 905.01

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Solution

The fourth proportional to 2,660.08, 3,990.63 and 905.01 is: 1,357.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.08 : 3,990.63 = 905.01 : x
  2. Step 2: Convert to fraction form
    2,660.08/3,990.63 = 905.01/x
  3. Step 3: Cross multiply
    2,660.08x = 3,990.63 × 905.01
  4. Step 4: Simplify right side
    2,660.08x = 3,611,561.50
  5. Step 5: Solve for x
    x = 3,611,561.50/2,660.08
  6. Step 6: Final answer
    x = 1,357.69

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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.