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Finding the Fourth Proportional to 1,087.45, 1,629.09 and 868.51

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Solution

The fourth proportional to 1,087.45, 1,629.09 and 868.51 is: 1,301.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.45 : 1,629.09 = 868.51 : x
  2. Step 2: Convert to fraction form
    1,087.45/1,629.09 = 868.51/x
  3. Step 3: Cross multiply
    1,087.45x = 1,629.09 × 868.51
  4. Step 4: Simplify right side
    1,087.45x = 1,414,880.96
  5. Step 5: Solve for x
    x = 1,414,880.96/1,087.45
  6. Step 6: Final answer
    x = 1,301.10

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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.