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Finding the Fourth Proportional to 764.70, 1,147.05 and 627.90

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Solution

The fourth proportional to 764.70, 1,147.05 and 627.90 is: 941.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.70 : 1,147.05 = 627.90 : x
  2. Step 2: Convert to fraction form
    764.70/1,147.05 = 627.90/x
  3. Step 3: Cross multiply
    764.70x = 1,147.05 × 627.90
  4. Step 4: Simplify right side
    764.70x = 720,232.70
  5. Step 5: Solve for x
    x = 720,232.70/764.70
  6. Step 6: Final answer
    x = 941.85

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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.