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Finding the Fourth Proportional to 1,091.82, 1,638.45 and 514.74

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Solution

The fourth proportional to 1,091.82, 1,638.45 and 514.74 is: 772.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.82 : 1,638.45 = 514.74 : x
  2. Step 2: Convert to fraction form
    1,091.82/1,638.45 = 514.74/x
  3. Step 3: Cross multiply
    1,091.82x = 1,638.45 × 514.74
  4. Step 4: Simplify right side
    1,091.82x = 843,375.75
  5. Step 5: Solve for x
    x = 843,375.75/1,091.82
  6. Step 6: Final answer
    x = 772.45

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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.