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Finding the Fourth Proportional to 628,161.70, 867,017.12 and 356,388.67

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Solution

The fourth proportional to 628,161.70, 867,017.12 and 356,388.67 is: 491,903.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,161.70 : 867,017.12 = 356,388.67 : x
  2. Step 2: Convert to fraction form
    628,161.70/867,017.12 = 356,388.67/x
  3. Step 3: Cross multiply
    628,161.70x = 867,017.12 × 356,388.67
  4. Step 4: Simplify right side
    628,161.70x = 308,995,078,264.03
  5. Step 5: Solve for x
    x = 308,995,078,264.03/628,161.70
  6. Step 6: Final answer
    x = 491,903.72

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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.