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Finding the Fourth Proportional to 1,119.72, 1,679.64 and 685.97

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Solution

The fourth proportional to 1,119.72, 1,679.64 and 685.97 is: 1,028.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.72 : 1,679.64 = 685.97 : x
  2. Step 2: Convert to fraction form
    1,119.72/1,679.64 = 685.97/x
  3. Step 3: Cross multiply
    1,119.72x = 1,679.64 × 685.97
  4. Step 4: Simplify right side
    1,119.72x = 1,152,177.98
  5. Step 5: Solve for x
    x = 1,152,177.98/1,119.72
  6. Step 6: Final answer
    x = 1,028.98

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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.