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Finding the Fourth Proportional to 139,428,279.20, 209,114,425.20 and 66,644,919.20

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Solution

The fourth proportional to 139,428,279.20, 209,114,425.20 and 66,644,919.20 is: 99,953,998.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,428,279.20 : 209,114,425.20 = 66,644,919.20 : x
  2. Step 2: Convert to fraction form
    139,428,279.20/209,114,425.20 = 66,644,919.20/x
  3. Step 3: Cross multiply
    139,428,279.20x = 209,114,425.20 × 66,644,919.20
  4. Step 4: Simplify right side
    139,428,279.20x = 13,936,413,971,008,444
  5. Step 5: Solve for x
    x = 13,936,413,971,008,444/139,428,279.20
  6. Step 6: Final answer
    x = 99,953,998.22

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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.