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Finding the Fourth Proportional to 1,231,718.76, 1,699,738.74 and 687,839.40

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Solution

The fourth proportional to 1,231,718.76, 1,699,738.74 and 687,839.40 is: 949,199.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231,718.76 : 1,699,738.74 = 687,839.40 : x
  2. Step 2: Convert to fraction form
    1,231,718.76/1,699,738.74 = 687,839.40/x
  3. Step 3: Cross multiply
    1,231,718.76x = 1,699,738.74 × 687,839.40
  4. Step 4: Simplify right side
    1,231,718.76x = 1,169,147,275,078.36
  5. Step 5: Solve for x
    x = 1,169,147,275,078.36/1,231,718.76
  6. Step 6: Final answer
    x = 949,199.86

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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.