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Finding the Fourth Proportional to 1,396,923.09, 1,928,280.48 and 816,334.74

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Solution

The fourth proportional to 1,396,923.09, 1,928,280.48 and 816,334.74 is: 1,126,849.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396,923.09 : 1,928,280.48 = 816,334.74 : x
  2. Step 2: Convert to fraction form
    1,396,923.09/1,928,280.48 = 816,334.74/x
  3. Step 3: Cross multiply
    1,396,923.09x = 1,928,280.48 × 816,334.74
  4. Step 4: Simplify right side
    1,396,923.09x = 1,574,122,344,287.88
  5. Step 5: Solve for x
    x = 1,574,122,344,287.88/1,396,923.09
  6. Step 6: Final answer
    x = 1,126,849.69

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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.