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Finding the Fourth Proportional to 1,919.68, 2,877.60 and 764.80

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Solution

The fourth proportional to 1,919.68, 2,877.60 and 764.80 is: 1,146.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.68 : 2,877.60 = 764.80 : x
  2. Step 2: Convert to fraction form
    1,919.68/2,877.60 = 764.80/x
  3. Step 3: Cross multiply
    1,919.68x = 2,877.60 × 764.80
  4. Step 4: Simplify right side
    1,919.68x = 2,200,788.48
  5. Step 5: Solve for x
    x = 2,200,788.48/1,919.68
  6. Step 6: Final answer
    x = 1,146.44

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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.