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Finding the Fourth Proportional to 139,968,394.80, 209,952,592.20 and 78,494,449.20

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Solution

The fourth proportional to 139,968,394.80, 209,952,592.20 and 78,494,449.20 is: 117,741,673.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,394.80 : 209,952,592.20 = 78,494,449.20 : x
  2. Step 2: Convert to fraction form
    139,968,394.80/209,952,592.20 = 78,494,449.20/x
  3. Step 3: Cross multiply
    139,968,394.80x = 209,952,592.20 × 78,494,449.20
  4. Step 4: Simplify right side
    139,968,394.80x = 16,480,113,082,851,216
  5. Step 5: Solve for x
    x = 16,480,113,082,851,216/139,968,394.80
  6. Step 6: Final answer
    x = 117,741,673.80

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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.