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Finding the Fourth Proportional to 741.72, 1,112.41 and 221.64

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Solution

The fourth proportional to 741.72, 1,112.41 and 221.64 is: 332.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.72 : 1,112.41 = 221.64 : x
  2. Step 2: Convert to fraction form
    741.72/1,112.41 = 221.64/x
  3. Step 3: Cross multiply
    741.72x = 1,112.41 × 221.64
  4. Step 4: Simplify right side
    741.72x = 246,550.66
  5. Step 5: Solve for x
    x = 246,550.66/741.72
  6. Step 6: Final answer
    x = 332.40

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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.