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Finding the Fourth Proportional to 1,261.79, 1,893 and 742.22

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Solution

The fourth proportional to 1,261.79, 1,893 and 742.22 is: 1,113.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.79 : 1,893 = 742.22 : x
  2. Step 2: Convert to fraction form
    1,261.79/1,893 = 742.22/x
  3. Step 3: Cross multiply
    1,261.79x = 1,893 × 742.22
  4. Step 4: Simplify right side
    1,261.79x = 1,405,013.00
  5. Step 5: Solve for x
    x = 1,405,013.00/1,261.79
  6. Step 6: Final answer
    x = 1,113.51

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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.