Home / 680,450.85-938,961.18-393,990.30

Finding the Fourth Proportional to 680,450.85, 938,961.18 and 393,990.30

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Solution

The fourth proportional to 680,450.85, 938,961.18 and 393,990.30 is: 543,671.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,450.85 : 938,961.18 = 393,990.30 : x
  2. Step 2: Convert to fraction form
    680,450.85/938,961.18 = 393,990.30/x
  3. Step 3: Cross multiply
    680,450.85x = 938,961.18 × 393,990.30
  4. Step 4: Simplify right side
    680,450.85x = 369,941,596,996.55
  5. Step 5: Solve for x
    x = 369,941,596,996.55/680,450.85
  6. Step 6: Final answer
    x = 543,671.30

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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.