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Finding the Fourth Proportional to 128,719,390.80, 193,079,086.20 and 128,719,390.80

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Solution

The fourth proportional to 128,719,390.80, 193,079,086.20 and 128,719,390.80 is: 193,079,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,719,390.80 : 193,079,086.20 = 128,719,390.80 : x
  2. Step 2: Convert to fraction form
    128,719,390.80/193,079,086.20 = 128,719,390.80/x
  3. Step 3: Cross multiply
    128,719,390.80x = 193,079,086.20 × 128,719,390.80
  4. Step 4: Simplify right side
    128,719,390.80x = 24,853,022,351,884,684
  5. Step 5: Solve for x
    x = 24,853,022,351,884,684/128,719,390.80
  6. Step 6: Final answer
    x = 193,079,086.20

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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.