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Finding the Fourth Proportional to 741.34, 1,111.86 and 279.11

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Solution

The fourth proportional to 741.34, 1,111.86 and 279.11 is: 418.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.34 : 1,111.86 = 279.11 : x
  2. Step 2: Convert to fraction form
    741.34/1,111.86 = 279.11/x
  3. Step 3: Cross multiply
    741.34x = 1,111.86 × 279.11
  4. Step 4: Simplify right side
    741.34x = 310,331.68
  5. Step 5: Solve for x
    x = 310,331.68/741.34
  6. Step 6: Final answer
    x = 418.61

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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.