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Finding the Fourth Proportional to 2,659.97, 3,989.97 and 928.60

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Solution

The fourth proportional to 2,659.97, 3,989.97 and 928.60 is: 1,392.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,659.97 : 3,989.97 = 928.60 : x
  2. Step 2: Convert to fraction form
    2,659.97/3,989.97 = 928.60/x
  3. Step 3: Cross multiply
    2,659.97x = 3,989.97 × 928.60
  4. Step 4: Simplify right side
    2,659.97x = 3,705,076.17
  5. Step 5: Solve for x
    x = 3,705,076.17/2,659.97
  6. Step 6: Final answer
    x = 1,392.90

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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.