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Finding the Fourth Proportional to 768.18, 1,145.44 and 758.62

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Solution

The fourth proportional to 768.18, 1,145.44 and 758.62 is: 1,131.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.18 : 1,145.44 = 758.62 : x
  2. Step 2: Convert to fraction form
    768.18/1,145.44 = 758.62/x
  3. Step 3: Cross multiply
    768.18x = 1,145.44 × 758.62
  4. Step 4: Simplify right side
    768.18x = 868,949.63
  5. Step 5: Solve for x
    x = 868,949.63/768.18
  6. Step 6: Final answer
    x = 1,131.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.