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Finding the Fourth Proportional to 1,229.05, 1,840.61 and 766.25

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Solution

The fourth proportional to 1,229.05, 1,840.61 and 766.25 is: 1,147.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.05 : 1,840.61 = 766.25 : x
  2. Step 2: Convert to fraction form
    1,229.05/1,840.61 = 766.25/x
  3. Step 3: Cross multiply
    1,229.05x = 1,840.61 × 766.25
  4. Step 4: Simplify right side
    1,229.05x = 1,410,367.41
  5. Step 5: Solve for x
    x = 1,410,367.41/1,229.05
  6. Step 6: Final answer
    x = 1,147.53

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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.