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Finding the Fourth Proportional to 139,969,312.80, 209,953,969.20 and 123,530,071.20

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Solution

The fourth proportional to 139,969,312.80, 209,953,969.20 and 123,530,071.20 is: 185,295,106.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,312.80 : 209,953,969.20 = 123,530,071.20 : x
  2. Step 2: Convert to fraction form
    139,969,312.80/209,953,969.20 = 123,530,071.20/x
  3. Step 3: Cross multiply
    139,969,312.80x = 209,953,969.20 × 123,530,071.20
  4. Step 4: Simplify right side
    139,969,312.80x = 25,935,628,763,998,608
  5. Step 5: Solve for x
    x = 25,935,628,763,998,608/139,969,312.80
  6. Step 6: Final answer
    x = 185,295,106.80

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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.