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Finding the Fourth Proportional to 1,321,425.40, 1,982,138.10 and 789,984.40

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Solution

The fourth proportional to 1,321,425.40, 1,982,138.10 and 789,984.40 is: 1,184,976.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321,425.40 : 1,982,138.10 = 789,984.40 : x
  2. Step 2: Convert to fraction form
    1,321,425.40/1,982,138.10 = 789,984.40/x
  3. Step 3: Cross multiply
    1,321,425.40x = 1,982,138.10 × 789,984.40
  4. Step 4: Simplify right side
    1,321,425.40x = 1,565,858,177,645.64
  5. Step 5: Solve for x
    x = 1,565,858,177,645.64/1,321,425.40
  6. Step 6: Final answer
    x = 1,184,976.60

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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.