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Finding the Fourth Proportional to 139,968,256.80, 209,952,385.20 and 68,304,640.80

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Solution

The fourth proportional to 139,968,256.80, 209,952,385.20 and 68,304,640.80 is: 102,456,961.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,256.80 : 209,952,385.20 = 68,304,640.80 : x
  2. Step 2: Convert to fraction form
    139,968,256.80/209,952,385.20 = 68,304,640.80/x
  3. Step 3: Cross multiply
    139,968,256.80x = 209,952,385.20 × 68,304,640.80
  4. Step 4: Simplify right side
    139,968,256.80x = 14,340,722,256,189,234
  5. Step 5: Solve for x
    x = 14,340,722,256,189,234/139,968,256.80
  6. Step 6: Final answer
    x = 102,456,961.20

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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.