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Finding the Fourth Proportional to 638,139.20, 892,213.90 and 638,139.20

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Solution

The fourth proportional to 638,139.20, 892,213.90 and 638,139.20 is: 892,213.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,139.20 : 892,213.90 = 638,139.20 : x
  2. Step 2: Convert to fraction form
    638,139.20/892,213.90 = 638,139.20/x
  3. Step 3: Cross multiply
    638,139.20x = 892,213.90 × 638,139.20
  4. Step 4: Simplify right side
    638,139.20x = 569,356,664,374.88
  5. Step 5: Solve for x
    x = 569,356,664,374.88/638,139.20
  6. Step 6: Final answer
    x = 892,213.90

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1.5x scale

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.