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Finding the Fourth Proportional to 1,679.36, 2,517.48 and 639.05

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Solution

The fourth proportional to 1,679.36, 2,517.48 and 639.05 is: 957.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.36 : 2,517.48 = 639.05 : x
  2. Step 2: Convert to fraction form
    1,679.36/2,517.48 = 639.05/x
  3. Step 3: Cross multiply
    1,679.36x = 2,517.48 × 639.05
  4. Step 4: Simplify right side
    1,679.36x = 1,608,783.01
  5. Step 5: Solve for x
    x = 1,608,783.01/1,679.36
  6. Step 6: Final answer
    x = 957.98

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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.