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Finding the Fourth Proportional to 139,722,369.20, 209,583,553.80 and 138,765,775.40

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Solution

The fourth proportional to 139,722,369.20, 209,583,553.80 and 138,765,775.40 is: 208,148,663.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,722,369.20 : 209,583,553.80 = 138,765,775.40 : x
  2. Step 2: Convert to fraction form
    139,722,369.20/209,583,553.80 = 138,765,775.40/x
  3. Step 3: Cross multiply
    139,722,369.20x = 209,583,553.80 × 138,765,775.40
  4. Step 4: Simplify right side
    139,722,369.20x = 29,083,024,354,144,620
  5. Step 5: Solve for x
    x = 29,083,024,354,144,620/139,722,369.20
  6. Step 6: Final answer
    x = 208,148,663.10

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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.