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Finding the Fourth Proportional to 1,239.14, 1,709.94 and 679.50

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Solution

The fourth proportional to 1,239.14, 1,709.94 and 679.50 is: 937.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.14 : 1,709.94 = 679.50 : x
  2. Step 2: Convert to fraction form
    1,239.14/1,709.94 = 679.50/x
  3. Step 3: Cross multiply
    1,239.14x = 1,709.94 × 679.50
  4. Step 4: Simplify right side
    1,239.14x = 1,161,906.78
  5. Step 5: Solve for x
    x = 1,161,906.78/1,239.14
  6. Step 6: Final answer
    x = 937.67

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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.