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Finding the Fourth Proportional to 999.62, 1,378.75 and 866.60

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Solution

The fourth proportional to 999.62, 1,378.75 and 866.60 is: 1,195.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.62 : 1,378.75 = 866.60 : x
  2. Step 2: Convert to fraction form
    999.62/1,378.75 = 866.60/x
  3. Step 3: Cross multiply
    999.62x = 1,378.75 × 866.60
  4. Step 4: Simplify right side
    999.62x = 1,194,826.23
  5. Step 5: Solve for x
    x = 1,194,826.23/999.62
  6. Step 6: Final answer
    x = 1,195.29

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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.