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Finding the Fourth Proportional to 1,489.50, 2,055.60 and 868.50

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Solution

The fourth proportional to 1,489.50, 2,055.60 and 868.50 is: 1,198.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.50 : 2,055.60 = 868.50 : x
  2. Step 2: Convert to fraction form
    1,489.50/2,055.60 = 868.50/x
  3. Step 3: Cross multiply
    1,489.50x = 2,055.60 × 868.50
  4. Step 4: Simplify right side
    1,489.50x = 1,785,288.60
  5. Step 5: Solve for x
    x = 1,785,288.60/1,489.50
  6. Step 6: Final answer
    x = 1,198.58

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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.