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Finding the Fourth Proportional to 764.40, 1,144.92 and 627.12

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Solution

The fourth proportional to 764.40, 1,144.92 and 627.12 is: 939.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.40 : 1,144.92 = 627.12 : x
  2. Step 2: Convert to fraction form
    764.40/1,144.92 = 627.12/x
  3. Step 3: Cross multiply
    764.40x = 1,144.92 × 627.12
  4. Step 4: Simplify right side
    764.40x = 718,002.23
  5. Step 5: Solve for x
    x = 718,002.23/764.40
  6. Step 6: Final answer
    x = 939.30

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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.