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Finding the Fourth Proportional to 716,290.89, 988,460.60 and 394,000.91

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Solution

The fourth proportional to 716,290.89, 988,460.60 and 394,000.91 is: 543,709.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,290.89 : 988,460.60 = 394,000.91 : x
  2. Step 2: Convert to fraction form
    716,290.89/988,460.60 = 394,000.91/x
  3. Step 3: Cross multiply
    716,290.89x = 988,460.60 × 394,000.91
  4. Step 4: Simplify right side
    716,290.89x = 389,454,375,899.15
  5. Step 5: Solve for x
    x = 389,454,375,899.15/716,290.89
  6. Step 6: Final answer
    x = 543,709.80

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.