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Finding the Fourth Proportional to 765.31, 1,145.22 and 662.94

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Solution

The fourth proportional to 765.31, 1,145.22 and 662.94 is: 992.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.31 : 1,145.22 = 662.94 : x
  2. Step 2: Convert to fraction form
    765.31/1,145.22 = 662.94/x
  3. Step 3: Cross multiply
    765.31x = 1,145.22 × 662.94
  4. Step 4: Simplify right side
    765.31x = 759,212.15
  5. Step 5: Solve for x
    x = 759,212.15/765.31
  6. Step 6: Final answer
    x = 992.04

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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.