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Finding the Fourth Proportional to 638,139.70, 892,214.60 and 638,139.70

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Solution

The fourth proportional to 638,139.70, 892,214.60 and 638,139.70 is: 892,214.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,139.70 : 892,214.60 = 638,139.70 : x
  2. Step 2: Convert to fraction form
    638,139.70/892,214.60 = 638,139.70/x
  3. Step 3: Cross multiply
    638,139.70x = 892,214.60 × 638,139.70
  4. Step 4: Simplify right side
    638,139.70x = 569,357,557,179.62
  5. Step 5: Solve for x
    x = 569,357,557,179.62/638,139.70
  6. Step 6: Final answer
    x = 892,214.60

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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.