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Finding the Fourth Proportional to 742.12, 1,111.11 and 376.12

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Solution

The fourth proportional to 742.12, 1,111.11 and 376.12 is: 563.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.12 : 1,111.11 = 376.12 : x
  2. Step 2: Convert to fraction form
    742.12/1,111.11 = 376.12/x
  3. Step 3: Cross multiply
    742.12x = 1,111.11 × 376.12
  4. Step 4: Simplify right side
    742.12x = 417,910.69
  5. Step 5: Solve for x
    x = 417,910.69/742.12
  6. Step 6: Final answer
    x = 563.13

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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.