Home / 685,801.60-1,028,702.40-639,145.60

Finding the Fourth Proportional to 685,801.60, 1,028,702.40 and 639,145.60

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Solution

The fourth proportional to 685,801.60, 1,028,702.40 and 639,145.60 is: 958,718.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,801.60 : 1,028,702.40 = 639,145.60 : x
  2. Step 2: Convert to fraction form
    685,801.60/1,028,702.40 = 639,145.60/x
  3. Step 3: Cross multiply
    685,801.60x = 1,028,702.40 × 639,145.60
  4. Step 4: Simplify right side
    685,801.60x = 657,490,612,669.44
  5. Step 5: Solve for x
    x = 657,490,612,669.44/685,801.60
  6. Step 6: Final answer
    x = 958,718.40

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Double scale
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Similar ratio
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1.5x scale

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.