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Finding the Fourth Proportional to 139,969,903.20, 209,954,854.80 and 125,861,128.80

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Solution

The fourth proportional to 139,969,903.20, 209,954,854.80 and 125,861,128.80 is: 188,791,693.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,903.20 : 209,954,854.80 = 125,861,128.80 : x
  2. Step 2: Convert to fraction form
    139,969,903.20/209,954,854.80 = 125,861,128.80/x
  3. Step 3: Cross multiply
    139,969,903.20x = 209,954,854.80 × 125,861,128.80
  4. Step 4: Simplify right side
    139,969,903.20x = 26,425,155,022,168,100
  5. Step 5: Solve for x
    x = 26,425,155,022,168,100/139,969,903.20
  6. Step 6: Final answer
    x = 188,791,693.20

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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.