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Finding the Fourth Proportional to 741.10, 1,111.45 and 221.08

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Solution

The fourth proportional to 741.10, 1,111.45 and 221.08 is: 331.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.10 : 1,111.45 = 221.08 : x
  2. Step 2: Convert to fraction form
    741.10/1,111.45 = 221.08/x
  3. Step 3: Cross multiply
    741.10x = 1,111.45 × 221.08
  4. Step 4: Simplify right side
    741.10x = 245,719.37
  5. Step 5: Solve for x
    x = 245,719.37/741.10
  6. Step 6: Final answer
    x = 331.56

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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.