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Finding the Fourth Proportional to 1,389,755.22, 1,917,843.81 and 786,143.22

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Solution

The fourth proportional to 1,389,755.22, 1,917,843.81 and 786,143.22 is: 1,084,867.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,755.22 : 1,917,843.81 = 786,143.22 : x
  2. Step 2: Convert to fraction form
    1,389,755.22/1,917,843.81 = 786,143.22/x
  3. Step 3: Cross multiply
    1,389,755.22x = 1,917,843.81 × 786,143.22
  4. Step 4: Simplify right side
    1,389,755.22x = 1,507,699,908,250.47
  5. Step 5: Solve for x
    x = 1,507,699,908,250.47/1,389,755.22
  6. Step 6: Final answer
    x = 1,084,867.24

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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.