Home / 685,416.52-945,789.78-398,987.56

Finding the Fourth Proportional to 685,416.52, 945,789.78 and 398,987.56

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Solution

The fourth proportional to 685,416.52, 945,789.78 and 398,987.56 is: 550,553.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,416.52 : 945,789.78 = 398,987.56 : x
  2. Step 2: Convert to fraction form
    685,416.52/945,789.78 = 398,987.56/x
  3. Step 3: Cross multiply
    685,416.52x = 945,789.78 × 398,987.56
  4. Step 4: Simplify right side
    685,416.52x = 377,358,356,595.14
  5. Step 5: Solve for x
    x = 377,358,356,595.14/685,416.52
  6. Step 6: Final answer
    x = 550,553.34

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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.