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Finding the Fourth Proportional to 853,640.60, 1,280,460.90 and 428,487.80

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Solution

The fourth proportional to 853,640.60, 1,280,460.90 and 428,487.80 is: 642,731.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    853,640.60 : 1,280,460.90 = 428,487.80 : x
  2. Step 2: Convert to fraction form
    853,640.60/1,280,460.90 = 428,487.80/x
  3. Step 3: Cross multiply
    853,640.60x = 1,280,460.90 × 428,487.80
  4. Step 4: Simplify right side
    853,640.60x = 548,661,874,027.02
  5. Step 5: Solve for x
    x = 548,661,874,027.02/853,640.60
  6. Step 6: Final answer
    x = 642,731.70

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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.