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Finding the Fourth Proportional to 1,317.33, 1,821.03 and 1,239.87

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Solution

The fourth proportional to 1,317.33, 1,821.03 and 1,239.87 is: 1,713.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.33 : 1,821.03 = 1,239.87 : x
  2. Step 2: Convert to fraction form
    1,317.33/1,821.03 = 1,239.87/x
  3. Step 3: Cross multiply
    1,317.33x = 1,821.03 × 1,239.87
  4. Step 4: Simplify right side
    1,317.33x = 2,257,849.62
  5. Step 5: Solve for x
    x = 2,257,849.62/1,317.33
  6. Step 6: Final answer
    x = 1,713.96

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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.