Home / 685,940.40-1,028,910.60-647,449.20

Finding the Fourth Proportional to 685,940.40, 1,028,910.60 and 647,449.20

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Solution

The fourth proportional to 685,940.40, 1,028,910.60 and 647,449.20 is: 971,173.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,940.40 : 1,028,910.60 = 647,449.20 : x
  2. Step 2: Convert to fraction form
    685,940.40/1,028,910.60 = 647,449.20/x
  3. Step 3: Cross multiply
    685,940.40x = 1,028,910.60 × 647,449.20
  4. Step 4: Simplify right side
    685,940.40x = 666,167,344,841.52
  5. Step 5: Solve for x
    x = 666,167,344,841.52/685,940.40
  6. Step 6: Final answer
    x = 971,173.80

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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.