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Finding the Fourth Proportional to 2,079.76, 3,119.36 and 618.64

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Solution

The fourth proportional to 2,079.76, 3,119.36 and 618.64 is: 927.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.76 : 3,119.36 = 618.64 : x
  2. Step 2: Convert to fraction form
    2,079.76/3,119.36 = 618.64/x
  3. Step 3: Cross multiply
    2,079.76x = 3,119.36 × 618.64
  4. Step 4: Simplify right side
    2,079.76x = 1,929,760.87
  5. Step 5: Solve for x
    x = 1,929,760.87/2,079.76
  6. Step 6: Final answer
    x = 927.88

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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.