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Finding the Fourth Proportional to 1,412.97, 2,116.62 and 680.37

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Solution

The fourth proportional to 1,412.97, 2,116.62 and 680.37 is: 1,019.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.97 : 2,116.62 = 680.37 : x
  2. Step 2: Convert to fraction form
    1,412.97/2,116.62 = 680.37/x
  3. Step 3: Cross multiply
    1,412.97x = 2,116.62 × 680.37
  4. Step 4: Simplify right side
    1,412.97x = 1,440,084.75
  5. Step 5: Solve for x
    x = 1,440,084.75/1,412.97
  6. Step 6: Final answer
    x = 1,019.19

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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.