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Finding the Fourth Proportional to 1,378.67, 1,903.31 and 1,063.25

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Solution

The fourth proportional to 1,378.67, 1,903.31 and 1,063.25 is: 1,467.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.67 : 1,903.31 = 1,063.25 : x
  2. Step 2: Convert to fraction form
    1,378.67/1,903.31 = 1,063.25/x
  3. Step 3: Cross multiply
    1,378.67x = 1,903.31 × 1,063.25
  4. Step 4: Simplify right side
    1,378.67x = 2,023,694.36
  5. Step 5: Solve for x
    x = 2,023,694.36/1,378.67
  6. Step 6: Final answer
    x = 1,467.86

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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.