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Finding the Fourth Proportional to 899.36, 1,243.23 and 891.08

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Solution

The fourth proportional to 899.36, 1,243.23 and 891.08 is: 1,231.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.36 : 1,243.23 = 891.08 : x
  2. Step 2: Convert to fraction form
    899.36/1,243.23 = 891.08/x
  3. Step 3: Cross multiply
    899.36x = 1,243.23 × 891.08
  4. Step 4: Simplify right side
    899.36x = 1,107,817.39
  5. Step 5: Solve for x
    x = 1,107,817.39/899.36
  6. Step 6: Final answer
    x = 1,231.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.