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Finding the Fourth Proportional to 768.66, 1,154.22 and 685.64

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Solution

The fourth proportional to 768.66, 1,154.22 and 685.64 is: 1,029.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.66 : 1,154.22 = 685.64 : x
  2. Step 2: Convert to fraction form
    768.66/1,154.22 = 685.64/x
  3. Step 3: Cross multiply
    768.66x = 1,154.22 × 685.64
  4. Step 4: Simplify right side
    768.66x = 791,379.40
  5. Step 5: Solve for x
    x = 791,379.40/768.66
  6. Step 6: Final answer
    x = 1,029.56

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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.