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Finding the Fourth Proportional to 139,409,687.20, 209,114,530.80 and 81,929,495.20

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Solution

The fourth proportional to 139,409,687.20, 209,114,530.80 and 81,929,495.20 is: 122,894,242.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,409,687.20 : 209,114,530.80 = 81,929,495.20 : x
  2. Step 2: Convert to fraction form
    139,409,687.20/209,114,530.80 = 81,929,495.20/x
  3. Step 3: Cross multiply
    139,409,687.20x = 209,114,530.80 × 81,929,495.20
  4. Step 4: Simplify right side
    139,409,687.20x = 17,132,647,947,428,854
  5. Step 5: Solve for x
    x = 17,132,647,947,428,854/139,409,687.20
  6. Step 6: Final answer
    x = 122,894,242.80

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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.