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Finding the Fourth Proportional to 1,331,776.78, 1,837,851.96 and 728,164.78

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Solution

The fourth proportional to 1,331,776.78, 1,837,851.96 and 728,164.78 is: 1,004,867.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331,776.78 : 1,837,851.96 = 728,164.78 : x
  2. Step 2: Convert to fraction form
    1,331,776.78/1,837,851.96 = 728,164.78/x
  3. Step 3: Cross multiply
    1,331,776.78x = 1,837,851.96 × 728,164.78
  4. Step 4: Simplify right side
    1,331,776.78x = 1,338,259,068,125.97
  5. Step 5: Solve for x
    x = 1,338,259,068,125.97/1,331,776.78
  6. Step 6: Final answer
    x = 1,004,867.40

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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.