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Finding the Fourth Proportional to 1,260.45, 1,739.59 and 868

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Solution

The fourth proportional to 1,260.45, 1,739.59 and 868 is: 1,197.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.45 : 1,739.59 = 868 : x
  2. Step 2: Convert to fraction form
    1,260.45/1,739.59 = 868/x
  3. Step 3: Cross multiply
    1,260.45x = 1,739.59 × 868
  4. Step 4: Simplify right side
    1,260.45x = 1,509,964.12
  5. Step 5: Solve for x
    x = 1,509,964.12/1,260.45
  6. Step 6: Final answer
    x = 1,197.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.