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Finding the Fourth Proportional to 139,969,312.80, 209,953,969.20 and 79,503,136.80

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Solution

The fourth proportional to 139,969,312.80, 209,953,969.20 and 79,503,136.80 is: 119,254,705.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,312.80 : 209,953,969.20 = 79,503,136.80 : x
  2. Step 2: Convert to fraction form
    139,969,312.80/209,953,969.20 = 79,503,136.80/x
  3. Step 3: Cross multiply
    139,969,312.80x = 209,953,969.20 × 79,503,136.80
  4. Step 4: Simplify right side
    139,969,312.80x = 16,691,999,135,010,584
  5. Step 5: Solve for x
    x = 16,691,999,135,010,584/139,969,312.80
  6. Step 6: Final answer
    x = 119,254,705.20

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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.