Home / 685,640.40-1,029,043.80-307,143.60

Finding the Fourth Proportional to 685,640.40, 1,029,043.80 and 307,143.60

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Solution

The fourth proportional to 685,640.40, 1,029,043.80 and 307,143.60 is: 460,976.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,640.40 : 1,029,043.80 = 307,143.60 : x
  2. Step 2: Convert to fraction form
    685,640.40/1,029,043.80 = 307,143.60/x
  3. Step 3: Cross multiply
    685,640.40x = 1,029,043.80 × 307,143.60
  4. Step 4: Simplify right side
    685,640.40x = 316,064,217,289.68
  5. Step 5: Solve for x
    x = 316,064,217,289.68/685,640.40
  6. Step 6: Final answer
    x = 460,976.65

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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.