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Finding the Fourth Proportional to 764.39, 1,145.19 and 490.52

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Solution

The fourth proportional to 764.39, 1,145.19 and 490.52 is: 734.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.39 : 1,145.19 = 490.52 : x
  2. Step 2: Convert to fraction form
    764.39/1,145.19 = 490.52/x
  3. Step 3: Cross multiply
    764.39x = 1,145.19 × 490.52
  4. Step 4: Simplify right side
    764.39x = 561,738.60
  5. Step 5: Solve for x
    x = 561,738.60/764.39
  6. Step 6: Final answer
    x = 734.88

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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.