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Finding the Fourth Proportional to 1,284.66, 1,922.21 and 764.94

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Solution

The fourth proportional to 1,284.66, 1,922.21 and 764.94 is: 1,144.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.66 : 1,922.21 = 764.94 : x
  2. Step 2: Convert to fraction form
    1,284.66/1,922.21 = 764.94/x
  3. Step 3: Cross multiply
    1,284.66x = 1,922.21 × 764.94
  4. Step 4: Simplify right side
    1,284.66x = 1,470,379.42
  5. Step 5: Solve for x
    x = 1,470,379.42/1,284.66
  6. Step 6: Final answer
    x = 1,144.57

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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.