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Finding the Fourth Proportional to 685,215.02, 945,698.06 and 394,771.28

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Solution

The fourth proportional to 685,215.02, 945,698.06 and 394,771.28 is: 544,842.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,215.02 : 945,698.06 = 394,771.28 : x
  2. Step 2: Convert to fraction form
    685,215.02/945,698.06 = 394,771.28/x
  3. Step 3: Cross multiply
    685,215.02x = 945,698.06 × 394,771.28
  4. Step 4: Simplify right side
    685,215.02x = 373,334,431,275.47
  5. Step 5: Solve for x
    x = 373,334,431,275.47/685,215.02
  6. Step 6: Final answer
    x = 544,842.75

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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.