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Finding the Fourth Proportional to 1,338.48, 2,006.36 and 644.14

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Solution

The fourth proportional to 1,338.48, 2,006.36 and 644.14 is: 965.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.48 : 2,006.36 = 644.14 : x
  2. Step 2: Convert to fraction form
    1,338.48/2,006.36 = 644.14/x
  3. Step 3: Cross multiply
    1,338.48x = 2,006.36 × 644.14
  4. Step 4: Simplify right side
    1,338.48x = 1,292,376.73
  5. Step 5: Solve for x
    x = 1,292,376.73/1,338.48
  6. Step 6: Final answer
    x = 965.56

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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.