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Finding the Fourth Proportional to 762.88, 1,144.31 and 185.75

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Solution

The fourth proportional to 762.88, 1,144.31 and 185.75 is: 278.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.88 : 1,144.31 = 185.75 : x
  2. Step 2: Convert to fraction form
    762.88/1,144.31 = 185.75/x
  3. Step 3: Cross multiply
    762.88x = 1,144.31 × 185.75
  4. Step 4: Simplify right side
    762.88x = 212,555.58
  5. Step 5: Solve for x
    x = 212,555.58/762.88
  6. Step 6: Final answer
    x = 278.62

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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.