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Finding the Fourth Proportional to 1,398.84, 2,098.20 and 939.90

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Solution

The fourth proportional to 1,398.84, 2,098.20 and 939.90 is: 1,409.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.84 : 2,098.20 = 939.90 : x
  2. Step 2: Convert to fraction form
    1,398.84/2,098.20 = 939.90/x
  3. Step 3: Cross multiply
    1,398.84x = 2,098.20 × 939.90
  4. Step 4: Simplify right side
    1,398.84x = 1,972,098.18
  5. Step 5: Solve for x
    x = 1,972,098.18/1,398.84
  6. Step 6: Final answer
    x = 1,409.81

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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.