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Finding the Fourth Proportional to 1,086.54, 1,626.70 and 720.60

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Solution

The fourth proportional to 1,086.54, 1,626.70 and 720.60 is: 1,078.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.54 : 1,626.70 = 720.60 : x
  2. Step 2: Convert to fraction form
    1,086.54/1,626.70 = 720.60/x
  3. Step 3: Cross multiply
    1,086.54x = 1,626.70 × 720.60
  4. Step 4: Simplify right side
    1,086.54x = 1,172,188.28
  5. Step 5: Solve for x
    x = 1,172,188.28/1,086.54
  6. Step 6: Final answer
    x = 1,078.83

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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.