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Finding the Fourth Proportional to 139,409,610.20, 209,114,415.30 and 81,929,418.20

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Solution

The fourth proportional to 139,409,610.20, 209,114,415.30 and 81,929,418.20 is: 122,894,127.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,409,610.20 : 209,114,415.30 = 81,929,418.20 : x
  2. Step 2: Convert to fraction form
    139,409,610.20/209,114,415.30 = 81,929,418.20/x
  3. Step 3: Cross multiply
    139,409,610.20x = 209,114,415.30 × 81,929,418.20
  4. Step 4: Simplify right side
    139,409,610.20x = 17,132,622,382,762,180
  5. Step 5: Solve for x
    x = 17,132,622,382,762,180/139,409,610.20
  6. Step 6: Final answer
    x = 122,894,127.30

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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.