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Finding the Fourth Proportional to 1,321,986.78, 1,824,341.70 and 718,374.78

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Solution

The fourth proportional to 1,321,986.78, 1,824,341.70 and 718,374.78 is: 991,357.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321,986.78 : 1,824,341.70 = 718,374.78 : x
  2. Step 2: Convert to fraction form
    1,321,986.78/1,824,341.70 = 718,374.78/x
  3. Step 3: Cross multiply
    1,321,986.78x = 1,824,341.70 × 718,374.78
  4. Step 4: Simplify right side
    1,321,986.78x = 1,310,561,067,382.33
  5. Step 5: Solve for x
    x = 1,310,561,067,382.33/1,321,986.78
  6. Step 6: Final answer
    x = 991,357.17

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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.