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Finding the Fourth Proportional to 1,398.53, 2,097.79 and 1,090.61

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Solution

The fourth proportional to 1,398.53, 2,097.79 and 1,090.61 is: 1,635.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.53 : 2,097.79 = 1,090.61 : x
  2. Step 2: Convert to fraction form
    1,398.53/2,097.79 = 1,090.61/x
  3. Step 3: Cross multiply
    1,398.53x = 2,097.79 × 1,090.61
  4. Step 4: Simplify right side
    1,398.53x = 2,287,870.75
  5. Step 5: Solve for x
    x = 2,287,870.75/1,398.53
  6. Step 6: Final answer
    x = 1,635.91

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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.