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Finding the Fourth Proportional to 139,968,503.80, 209,952,755.70 and 105,480,388.60

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Solution

The fourth proportional to 139,968,503.80, 209,952,755.70 and 105,480,388.60 is: 158,220,582.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,503.80 : 209,952,755.70 = 105,480,388.60 : x
  2. Step 2: Convert to fraction form
    139,968,503.80/209,952,755.70 = 105,480,388.60/x
  3. Step 3: Cross multiply
    139,968,503.80x = 209,952,755.70 × 105,480,388.60
  4. Step 4: Simplify right side
    139,968,503.80x = 22,145,898,258,876,864
  5. Step 5: Solve for x
    x = 22,145,898,258,876,864/139,968,503.80
  6. Step 6: Final answer
    x = 158,220,582.90

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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.