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Finding the Fourth Proportional to 2,612.92, 3,919.56 and 764.06

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Solution

The fourth proportional to 2,612.92, 3,919.56 and 764.06 is: 1,146.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612.92 : 3,919.56 = 764.06 : x
  2. Step 2: Convert to fraction form
    2,612.92/3,919.56 = 764.06/x
  3. Step 3: Cross multiply
    2,612.92x = 3,919.56 × 764.06
  4. Step 4: Simplify right side
    2,612.92x = 2,994,779.01
  5. Step 5: Solve for x
    x = 2,994,779.01/2,612.92
  6. Step 6: Final answer
    x = 1,146.14

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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.