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Finding the Fourth Proportional to 139,797,998.40, 209,696,997.60 and 78,575,995.20

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Solution

The fourth proportional to 139,797,998.40, 209,696,997.60 and 78,575,995.20 is: 117,863,992.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,797,998.40 : 209,696,997.60 = 78,575,995.20 : x
  2. Step 2: Convert to fraction form
    139,797,998.40/209,696,997.60 = 78,575,995.20/x
  3. Step 3: Cross multiply
    139,797,998.40x = 209,696,997.60 × 78,575,995.20
  4. Step 4: Simplify right side
    139,797,998.40x = 16,477,150,276,872,012
  5. Step 5: Solve for x
    x = 16,477,150,276,872,012/139,797,998.40
  6. Step 6: Final answer
    x = 117,863,992.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.