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Finding the Fourth Proportional to 620,091.60, 930,137.40 and 407,515.20

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Solution

The fourth proportional to 620,091.60, 930,137.40 and 407,515.20 is: 611,272.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,091.60 : 930,137.40 = 407,515.20 : x
  2. Step 2: Convert to fraction form
    620,091.60/930,137.40 = 407,515.20/x
  3. Step 3: Cross multiply
    620,091.60x = 930,137.40 × 407,515.20
  4. Step 4: Simplify right side
    620,091.60x = 379,045,128,588.48
  5. Step 5: Solve for x
    x = 379,045,128,588.48/620,091.60
  6. Step 6: Final answer
    x = 611,272.80

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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.