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Finding the Fourth Proportional to 139,968,128.80, 209,952,193.20 and 103,688,423.20

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Solution

The fourth proportional to 139,968,128.80, 209,952,193.20 and 103,688,423.20 is: 155,532,634.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,128.80 : 209,952,193.20 = 103,688,423.20 : x
  2. Step 2: Convert to fraction form
    139,968,128.80/209,952,193.20 = 103,688,423.20/x
  3. Step 3: Cross multiply
    139,968,128.80x = 209,952,193.20 × 103,688,423.20
  4. Step 4: Simplify right side
    139,968,128.80x = 21,769,611,860,289,760
  5. Step 5: Solve for x
    x = 21,769,611,860,289,760/139,968,128.80
  6. Step 6: Final answer
    x = 155,532,634.80

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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.