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Finding the Fourth Proportional to 1,238.37, 1,853.91 and 689.81

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Solution

The fourth proportional to 1,238.37, 1,853.91 and 689.81 is: 1,032.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.37 : 1,853.91 = 689.81 : x
  2. Step 2: Convert to fraction form
    1,238.37/1,853.91 = 689.81/x
  3. Step 3: Cross multiply
    1,238.37x = 1,853.91 × 689.81
  4. Step 4: Simplify right side
    1,238.37x = 1,278,836.39
  5. Step 5: Solve for x
    x = 1,278,836.39/1,238.37
  6. Step 6: Final answer
    x = 1,032.68

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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.