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Finding the Fourth Proportional to 741.64, 1,111.68 and 279.12

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Solution

The fourth proportional to 741.64, 1,111.68 and 279.12 is: 418.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.64 : 1,111.68 = 279.12 : x
  2. Step 2: Convert to fraction form
    741.64/1,111.68 = 279.12/x
  3. Step 3: Cross multiply
    741.64x = 1,111.68 × 279.12
  4. Step 4: Simplify right side
    741.64x = 310,292.12
  5. Step 5: Solve for x
    x = 310,292.12/741.64
  6. Step 6: Final answer
    x = 418.39

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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.