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Finding the Fourth Proportional to 764.42, 1,146.66 and 270.80

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Solution

The fourth proportional to 764.42, 1,146.66 and 270.80 is: 406.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.42 : 1,146.66 = 270.80 : x
  2. Step 2: Convert to fraction form
    764.42/1,146.66 = 270.80/x
  3. Step 3: Cross multiply
    764.42x = 1,146.66 × 270.80
  4. Step 4: Simplify right side
    764.42x = 310,515.53
  5. Step 5: Solve for x
    x = 310,515.53/764.42
  6. Step 6: Final answer
    x = 406.21

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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.