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Finding the Fourth Proportional to 1,238.56, 1,709.21 and 679.03

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Solution

The fourth proportional to 1,238.56, 1,709.21 and 679.03 is: 937.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.56 : 1,709.21 = 679.03 : x
  2. Step 2: Convert to fraction form
    1,238.56/1,709.21 = 679.03/x
  3. Step 3: Cross multiply
    1,238.56x = 1,709.21 × 679.03
  4. Step 4: Simplify right side
    1,238.56x = 1,160,592.93
  5. Step 5: Solve for x
    x = 1,160,592.93/1,238.56
  6. Step 6: Final answer
    x = 937.05

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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.