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Finding the Fourth Proportional to 741.26, 1,111.16 and 278.92

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Solution

The fourth proportional to 741.26, 1,111.16 and 278.92 is: 418.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.26 : 1,111.16 = 278.92 : x
  2. Step 2: Convert to fraction form
    741.26/1,111.16 = 278.92/x
  3. Step 3: Cross multiply
    741.26x = 1,111.16 × 278.92
  4. Step 4: Simplify right side
    741.26x = 309,924.75
  5. Step 5: Solve for x
    x = 309,924.75/741.26
  6. Step 6: Final answer
    x = 418.11

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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.