Home / 685,859.44-946,948.18-428,128.78

Finding the Fourth Proportional to 685,859.44, 946,948.18 and 428,128.78

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Solution

The fourth proportional to 685,859.44, 946,948.18 and 428,128.78 is: 591,106.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,859.44 : 946,948.18 = 428,128.78 : x
  2. Step 2: Convert to fraction form
    685,859.44/946,948.18 = 428,128.78/x
  3. Step 3: Cross multiply
    685,859.44x = 946,948.18 × 428,128.78
  4. Step 4: Simplify right side
    685,859.44x = 405,415,769,026.62
  5. Step 5: Solve for x
    x = 405,415,769,026.62/685,859.44
  6. Step 6: Final answer
    x = 591,106.20

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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.