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Finding the Fourth Proportional to 638,138.70, 892,213.20 and 638,138.70

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Solution

The fourth proportional to 638,138.70, 892,213.20 and 638,138.70 is: 892,213.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,138.70 : 892,213.20 = 638,138.70 : x
  2. Step 2: Convert to fraction form
    638,138.70/892,213.20 = 638,138.70/x
  3. Step 3: Cross multiply
    638,138.70x = 892,213.20 × 638,138.70
  4. Step 4: Simplify right side
    638,138.70x = 569,355,771,570.84
  5. Step 5: Solve for x
    x = 569,355,771,570.84/638,138.70
  6. Step 6: Final answer
    x = 892,213.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.