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Finding the Fourth Proportional to 2,613.44, 3,919.20 and 764.08

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Solution

The fourth proportional to 2,613.44, 3,919.20 and 764.08 is: 1,145.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.44 : 3,919.20 = 764.08 : x
  2. Step 2: Convert to fraction form
    2,613.44/3,919.20 = 764.08/x
  3. Step 3: Cross multiply
    2,613.44x = 3,919.20 × 764.08
  4. Step 4: Simplify right side
    2,613.44x = 2,994,582.34
  5. Step 5: Solve for x
    x = 2,994,582.34/2,613.44
  6. Step 6: Final answer
    x = 1,145.84

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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.