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Finding the Fourth Proportional to 900.30, 1,239.43 and 789.60

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Solution

The fourth proportional to 900.30, 1,239.43 and 789.60 is: 1,087.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.30 : 1,239.43 = 789.60 : x
  2. Step 2: Convert to fraction form
    900.30/1,239.43 = 789.60/x
  3. Step 3: Cross multiply
    900.30x = 1,239.43 × 789.60
  4. Step 4: Simplify right side
    900.30x = 978,653.93
  5. Step 5: Solve for x
    x = 978,653.93/900.30
  6. Step 6: Final answer
    x = 1,087.03

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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.