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Finding the Fourth Proportional to 1,921.80, 2,883.94 and 689.18

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Solution

The fourth proportional to 1,921.80, 2,883.94 and 689.18 is: 1,034.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.80 : 2,883.94 = 689.18 : x
  2. Step 2: Convert to fraction form
    1,921.80/2,883.94 = 689.18/x
  3. Step 3: Cross multiply
    1,921.80x = 2,883.94 × 689.18
  4. Step 4: Simplify right side
    1,921.80x = 1,987,553.77
  5. Step 5: Solve for x
    x = 1,987,553.77/1,921.80
  6. Step 6: Final answer
    x = 1,034.21

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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.