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Finding the Fourth Proportional to 1,258,697.80, 1,736,997.78 and 685,736.20

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Solution

The fourth proportional to 1,258,697.80, 1,736,997.78 and 685,736.20 is: 946,313.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258,697.80 : 1,736,997.78 = 685,736.20 : x
  2. Step 2: Convert to fraction form
    1,258,697.80/1,736,997.78 = 685,736.20/x
  3. Step 3: Cross multiply
    1,258,697.80x = 1,736,997.78 × 685,736.20
  4. Step 4: Simplify right side
    1,258,697.80x = 1,191,122,257,065.64
  5. Step 5: Solve for x
    x = 1,191,122,257,065.64/1,258,697.80
  6. Step 6: Final answer
    x = 946,313.13

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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.