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Finding the Fourth Proportional to 764.64, 1,147.28 and 331.84

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Solution

The fourth proportional to 764.64, 1,147.28 and 331.84 is: 497.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.64 : 1,147.28 = 331.84 : x
  2. Step 2: Convert to fraction form
    764.64/1,147.28 = 331.84/x
  3. Step 3: Cross multiply
    764.64x = 1,147.28 × 331.84
  4. Step 4: Simplify right side
    764.64x = 380,713.40
  5. Step 5: Solve for x
    x = 380,713.40/764.64
  6. Step 6: Final answer
    x = 497.90

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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.