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Finding the Fourth Proportional to 128,720,312.70, 193,080,469.05 and 128,720,312.70

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Solution

The fourth proportional to 128,720,312.70, 193,080,469.05 and 128,720,312.70 is: 193,080,469.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,720,312.70 : 193,080,469.05 = 128,720,312.70 : x
  2. Step 2: Convert to fraction form
    128,720,312.70/193,080,469.05 = 128,720,312.70/x
  3. Step 3: Cross multiply
    128,720,312.70x = 193,080,469.05 × 128,720,312.70
  4. Step 4: Simplify right side
    128,720,312.70x = 24,853,378,352,378,676
  5. Step 5: Solve for x
    x = 24,853,378,352,378,676/128,720,312.70
  6. Step 6: Final answer
    x = 193,080,469.05

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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.