Home / 685,415.52-945,788.40-398,986.56

Finding the Fourth Proportional to 685,415.52, 945,788.40 and 398,986.56

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Solution

The fourth proportional to 685,415.52, 945,788.40 and 398,986.56 is: 550,551.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,415.52 : 945,788.40 = 398,986.56 : x
  2. Step 2: Convert to fraction form
    685,415.52/945,788.40 = 398,986.56/x
  3. Step 3: Cross multiply
    685,415.52x = 945,788.40 × 398,986.56
  4. Step 4: Simplify right side
    685,415.52x = 377,356,860,203.90
  5. Step 5: Solve for x
    x = 377,356,860,203.90/685,415.52
  6. Step 6: Final answer
    x = 550,551.96

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1.5x scale

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.