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Finding the Fourth Proportional to 718,869, 992,039.22 and 400,917

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Solution

The fourth proportional to 718,869, 992,039.22 and 400,917 is: 553,265.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,869 : 992,039.22 = 400,917 : x
  2. Step 2: Convert to fraction form
    718,869/992,039.22 = 400,917/x
  3. Step 3: Cross multiply
    718,869x = 992,039.22 × 400,917
  4. Step 4: Simplify right side
    718,869x = 397,725,387,964.74
  5. Step 5: Solve for x
    x = 397,725,387,964.74/718,869
  6. Step 6: Final answer
    x = 553,265.46

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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.