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Finding the Fourth Proportional to 139,969,313.70, 209,953,970.55 and 120,821,691.30

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Solution

The fourth proportional to 139,969,313.70, 209,953,970.55 and 120,821,691.30 is: 181,232,536.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,313.70 : 209,953,970.55 = 120,821,691.30 : x
  2. Step 2: Convert to fraction form
    139,969,313.70/209,953,970.55 = 120,821,691.30/x
  3. Step 3: Cross multiply
    139,969,313.70x = 209,953,970.55 × 120,821,691.30
  4. Step 4: Simplify right side
    139,969,313.70x = 25,366,993,817,001,392
  5. Step 5: Solve for x
    x = 25,366,993,817,001,392/139,969,313.70
  6. Step 6: Final answer
    x = 181,232,536.95

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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.