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Finding the Fourth Proportional to 765.81, 1,145.97 and 663.44

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Solution

The fourth proportional to 765.81, 1,145.97 and 663.44 is: 992.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.81 : 1,145.97 = 663.44 : x
  2. Step 2: Convert to fraction form
    765.81/1,145.97 = 663.44/x
  3. Step 3: Cross multiply
    765.81x = 1,145.97 × 663.44
  4. Step 4: Simplify right side
    765.81x = 760,282.34
  5. Step 5: Solve for x
    x = 760,282.34/765.81
  6. Step 6: Final answer
    x = 992.78

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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.