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Finding the Fourth Proportional to 764.25, 1,146.78 and 353.58

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Solution

The fourth proportional to 764.25, 1,146.78 and 353.58 is: 530.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.25 : 1,146.78 = 353.58 : x
  2. Step 2: Convert to fraction form
    764.25/1,146.78 = 353.58/x
  3. Step 3: Cross multiply
    764.25x = 1,146.78 × 353.58
  4. Step 4: Simplify right side
    764.25x = 405,478.47
  5. Step 5: Solve for x
    x = 405,478.47/764.25
  6. Step 6: Final answer
    x = 530.56

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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.