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Finding the Fourth Proportional to 139,968,393.80, 209,952,590.70 and 78,494,448.20

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Solution

The fourth proportional to 139,968,393.80, 209,952,590.70 and 78,494,448.20 is: 117,741,672.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,393.80 : 209,952,590.70 = 78,494,448.20 : x
  2. Step 2: Convert to fraction form
    139,968,393.80/209,952,590.70 = 78,494,448.20/x
  3. Step 3: Cross multiply
    139,968,393.80x = 209,952,590.70 × 78,494,448.20
  4. Step 4: Simplify right side
    139,968,393.80x = 16,480,112,755,156,952
  5. Step 5: Solve for x
    x = 16,480,112,755,156,952/139,968,393.80
  6. Step 6: Final answer
    x = 117,741,672.30

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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.