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Finding the Fourth Proportional to 766.88, 1,150.31 and 189.75

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Solution

The fourth proportional to 766.88, 1,150.31 and 189.75 is: 284.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.88 : 1,150.31 = 189.75 : x
  2. Step 2: Convert to fraction form
    766.88/1,150.31 = 189.75/x
  3. Step 3: Cross multiply
    766.88x = 1,150.31 × 189.75
  4. Step 4: Simplify right side
    766.88x = 218,271.32
  5. Step 5: Solve for x
    x = 218,271.32/766.88
  6. Step 6: Final answer
    x = 284.62

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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.