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Finding the Fourth Proportional to 1,239.20, 1,710.11 and 679.68

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Solution

The fourth proportional to 1,239.20, 1,710.11 and 679.68 is: 937.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.20 : 1,710.11 = 679.68 : x
  2. Step 2: Convert to fraction form
    1,239.20/1,710.11 = 679.68/x
  3. Step 3: Cross multiply
    1,239.20x = 1,710.11 × 679.68
  4. Step 4: Simplify right side
    1,239.20x = 1,162,328.85
  5. Step 5: Solve for x
    x = 1,162,328.85/1,239.20
  6. Step 6: Final answer
    x = 937.97

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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.