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Finding the Fourth Proportional to 1,238.81, 1,709.56 and 679.28

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Solution

The fourth proportional to 1,238.81, 1,709.56 and 679.28 is: 937.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.81 : 1,709.56 = 679.28 : x
  2. Step 2: Convert to fraction form
    1,238.81/1,709.56 = 679.28/x
  3. Step 3: Cross multiply
    1,238.81x = 1,709.56 × 679.28
  4. Step 4: Simplify right side
    1,238.81x = 1,161,269.92
  5. Step 5: Solve for x
    x = 1,161,269.92/1,238.81
  6. Step 6: Final answer
    x = 937.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.