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Finding the Fourth Proportional to 1,189.82, 1,642.74 and 748.40

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Solution

The fourth proportional to 1,189.82, 1,642.74 and 748.40 is: 1,033.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.82 : 1,642.74 = 748.40 : x
  2. Step 2: Convert to fraction form
    1,189.82/1,642.74 = 748.40/x
  3. Step 3: Cross multiply
    1,189.82x = 1,642.74 × 748.40
  4. Step 4: Simplify right side
    1,189.82x = 1,229,426.62
  5. Step 5: Solve for x
    x = 1,229,426.62/1,189.82
  6. Step 6: Final answer
    x = 1,033.29

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.