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Finding the Fourth Proportional to 1,687.03, 2,327.94 and 978.68

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Solution

The fourth proportional to 1,687.03, 2,327.94 and 978.68 is: 1,350.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.03 : 2,327.94 = 978.68 : x
  2. Step 2: Convert to fraction form
    1,687.03/2,327.94 = 978.68/x
  3. Step 3: Cross multiply
    1,687.03x = 2,327.94 × 978.68
  4. Step 4: Simplify right side
    1,687.03x = 2,278,314.14
  5. Step 5: Solve for x
    x = 2,278,314.14/1,687.03
  6. Step 6: Final answer
    x = 1,350.49

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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.