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Finding the Fourth Proportional to 139,969,336.80, 209,954,005.20 and 79,503,160.80

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Solution

The fourth proportional to 139,969,336.80, 209,954,005.20 and 79,503,160.80 is: 119,254,741.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,336.80 : 209,954,005.20 = 79,503,160.80 : x
  2. Step 2: Convert to fraction form
    139,969,336.80/209,954,005.20 = 79,503,160.80/x
  3. Step 3: Cross multiply
    139,969,336.80x = 209,954,005.20 × 79,503,160.80
  4. Step 4: Simplify right side
    139,969,336.80x = 16,692,007,036,019,634
  5. Step 5: Solve for x
    x = 16,692,007,036,019,634/139,969,336.80
  6. Step 6: Final answer
    x = 119,254,741.20

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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.