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Finding the Fourth Proportional to 1,391.70, 1,921.14 and 998.04

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Solution

The fourth proportional to 1,391.70, 1,921.14 and 998.04 is: 1,377.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.70 : 1,921.14 = 998.04 : x
  2. Step 2: Convert to fraction form
    1,391.70/1,921.14 = 998.04/x
  3. Step 3: Cross multiply
    1,391.70x = 1,921.14 × 998.04
  4. Step 4: Simplify right side
    1,391.70x = 1,917,374.57
  5. Step 5: Solve for x
    x = 1,917,374.57/1,391.70
  6. Step 6: Final answer
    x = 1,377.72

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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.