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Finding the Fourth Proportional to 1,775.28, 2,662.92 and 679.60

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Solution

The fourth proportional to 1,775.28, 2,662.92 and 679.60 is: 1,019.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,775.28 : 2,662.92 = 679.60 : x
  2. Step 2: Convert to fraction form
    1,775.28/2,662.92 = 679.60/x
  3. Step 3: Cross multiply
    1,775.28x = 2,662.92 × 679.60
  4. Step 4: Simplify right side
    1,775.28x = 1,809,720.43
  5. Step 5: Solve for x
    x = 1,809,720.43/1,775.28
  6. Step 6: Final answer
    x = 1,019.40

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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.