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Finding the Fourth Proportional to 1,378.63, 2,064.51 and 965.83

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Solution

The fourth proportional to 1,378.63, 2,064.51 and 965.83 is: 1,446.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.63 : 2,064.51 = 965.83 : x
  2. Step 2: Convert to fraction form
    1,378.63/2,064.51 = 965.83/x
  3. Step 3: Cross multiply
    1,378.63x = 2,064.51 × 965.83
  4. Step 4: Simplify right side
    1,378.63x = 1,993,965.69
  5. Step 5: Solve for x
    x = 1,993,965.69/1,378.63
  6. Step 6: Final answer
    x = 1,446.34

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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.