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Finding the Fourth Proportional to 741.49, 1,112.42 and 279.38

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Solution

The fourth proportional to 741.49, 1,112.42 and 279.38 is: 419.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.49 : 1,112.42 = 279.38 : x
  2. Step 2: Convert to fraction form
    741.49/1,112.42 = 279.38/x
  3. Step 3: Cross multiply
    741.49x = 1,112.42 × 279.38
  4. Step 4: Simplify right side
    741.49x = 310,791.38
  5. Step 5: Solve for x
    x = 310,791.38/741.49
  6. Step 6: Final answer
    x = 419.15

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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.