Home / 685,731.80-1,026,629.40-420,011.30

Finding the Fourth Proportional to 685,731.80, 1,026,629.40 and 420,011.30

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Solution

The fourth proportional to 685,731.80, 1,026,629.40 and 420,011.30 is: 628,811.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,731.80 : 1,026,629.40 = 420,011.30 : x
  2. Step 2: Convert to fraction form
    685,731.80/1,026,629.40 = 420,011.30/x
  3. Step 3: Cross multiply
    685,731.80x = 1,026,629.40 × 420,011.30
  4. Step 4: Simplify right side
    685,731.80x = 431,195,948,912.22
  5. Step 5: Solve for x
    x = 431,195,948,912.22/685,731.80
  6. Step 6: Final answer
    x = 628,811.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.