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Finding the Fourth Proportional to 1,679.60, 2,517.71 and 639.34

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Solution

The fourth proportional to 1,679.60, 2,517.71 and 639.34 is: 958.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.60 : 2,517.71 = 639.34 : x
  2. Step 2: Convert to fraction form
    1,679.60/2,517.71 = 639.34/x
  3. Step 3: Cross multiply
    1,679.60x = 2,517.71 × 639.34
  4. Step 4: Simplify right side
    1,679.60x = 1,609,663.22
  5. Step 5: Solve for x
    x = 1,609,663.22/1,679.60
  6. Step 6: Final answer
    x = 958.36

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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.