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Finding the Fourth Proportional to 741.63, 1,112.41 and 279.24

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Solution

The fourth proportional to 741.63, 1,112.41 and 279.24 is: 418.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.63 : 1,112.41 = 279.24 : x
  2. Step 2: Convert to fraction form
    741.63/1,112.41 = 279.24/x
  3. Step 3: Cross multiply
    741.63x = 1,112.41 × 279.24
  4. Step 4: Simplify right side
    741.63x = 310,629.37
  5. Step 5: Solve for x
    x = 310,629.37/741.63
  6. Step 6: Final answer
    x = 418.85

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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.