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Finding the Fourth Proportional to 1,091.98, 1,635.75 and 872.97

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Solution

The fourth proportional to 1,091.98, 1,635.75 and 872.97 is: 1,307.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.98 : 1,635.75 = 872.97 : x
  2. Step 2: Convert to fraction form
    1,091.98/1,635.75 = 872.97/x
  3. Step 3: Cross multiply
    1,091.98x = 1,635.75 × 872.97
  4. Step 4: Simplify right side
    1,091.98x = 1,427,960.68
  5. Step 5: Solve for x
    x = 1,427,960.68/1,091.98
  6. Step 6: Final answer
    x = 1,307.68

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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.