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Finding the Fourth Proportional to 1,378.96, 2,066.49 and 684.97

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Solution

The fourth proportional to 1,378.96, 2,066.49 and 684.97 is: 1,026.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.96 : 2,066.49 = 684.97 : x
  2. Step 2: Convert to fraction form
    1,378.96/2,066.49 = 684.97/x
  3. Step 3: Cross multiply
    1,378.96x = 2,066.49 × 684.97
  4. Step 4: Simplify right side
    1,378.96x = 1,415,473.32
  5. Step 5: Solve for x
    x = 1,415,473.32/1,378.96
  6. Step 6: Final answer
    x = 1,026.48

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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.