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Finding the Fourth Proportional to 978,231.20, 1,372,012 and 978,231.20

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Solution

The fourth proportional to 978,231.20, 1,372,012 and 978,231.20 is: 1,372,012

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,231.20 : 1,372,012 = 978,231.20 : x
  2. Step 2: Convert to fraction form
    978,231.20/1,372,012 = 978,231.20/x
  3. Step 3: Cross multiply
    978,231.20x = 1,372,012 × 978,231.20
  4. Step 4: Simplify right side
    978,231.20x = 1,342,144,945,174.40
  5. Step 5: Solve for x
    x = 1,342,144,945,174.40/978,231.20
  6. Step 6: Final answer
    x = 1,372,012

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.