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Finding the Fourth Proportional to 1,679.10, 2,516.96 and 638.83

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Solution

The fourth proportional to 1,679.10, 2,516.96 and 638.83 is: 957.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.10 : 2,516.96 = 638.83 : x
  2. Step 2: Convert to fraction form
    1,679.10/2,516.96 = 638.83/x
  3. Step 3: Cross multiply
    1,679.10x = 2,516.96 × 638.83
  4. Step 4: Simplify right side
    1,679.10x = 1,607,906.36
  5. Step 5: Solve for x
    x = 1,607,906.36/1,679.10
  6. Step 6: Final answer
    x = 957.60

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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.