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Finding the Fourth Proportional to 1,214,647.40, 1,821,971.10 and 978,451.40

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Solution

The fourth proportional to 1,214,647.40, 1,821,971.10 and 978,451.40 is: 1,467,677.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214,647.40 : 1,821,971.10 = 978,451.40 : x
  2. Step 2: Convert to fraction form
    1,214,647.40/1,821,971.10 = 978,451.40/x
  3. Step 3: Cross multiply
    1,214,647.40x = 1,821,971.10 × 978,451.40
  4. Step 4: Simplify right side
    1,214,647.40x = 1,782,710,173,554.54
  5. Step 5: Solve for x
    x = 1,782,710,173,554.54/1,214,647.40
  6. Step 6: Final answer
    x = 1,467,677.10

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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.