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Finding the Fourth Proportional to 1,323.78, 1,827.21 and 764.65

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Solution

The fourth proportional to 1,323.78, 1,827.21 and 764.65 is: 1,055.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.78 : 1,827.21 = 764.65 : x
  2. Step 2: Convert to fraction form
    1,323.78/1,827.21 = 764.65/x
  3. Step 3: Cross multiply
    1,323.78x = 1,827.21 × 764.65
  4. Step 4: Simplify right side
    1,323.78x = 1,397,181.28
  5. Step 5: Solve for x
    x = 1,397,181.28/1,323.78
  6. Step 6: Final answer
    x = 1,055.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.