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Finding the Fourth Proportional to 1,388,235,819.54, 1,915,800,679.62 and 761,704,081.44

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Solution

The fourth proportional to 1,388,235,819.54, 1,915,800,679.62 and 761,704,081.44 is: 1,051,170,972.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,235,819.54 : 1,915,800,679.62 = 761,704,081.44 : x
  2. Step 2: Convert to fraction form
    1,388,235,819.54/1,915,800,679.62 = 761,704,081.44/x
  3. Step 3: Cross multiply
    1,388,235,819.54x = 1,915,800,679.62 × 761,704,081.44
  4. Step 4: Simplify right side
    1,388,235,819.54x = 1,459,273,196,892,079,872
  5. Step 5: Solve for x
    x = 1,459,273,196,892,079,872/1,388,235,819.54
  6. Step 6: Final answer
    x = 1,051,170,972.79

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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.