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Finding the Fourth Proportional to 764.22, 1,146.72 and 331.38

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Solution

The fourth proportional to 764.22, 1,146.72 and 331.38 is: 497.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.22 : 1,146.72 = 331.38 : x
  2. Step 2: Convert to fraction form
    764.22/1,146.72 = 331.38/x
  3. Step 3: Cross multiply
    764.22x = 1,146.72 × 331.38
  4. Step 4: Simplify right side
    764.22x = 380,000.07
  5. Step 5: Solve for x
    x = 380,000.07/764.22
  6. Step 6: Final answer
    x = 497.24

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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.