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Finding the Fourth Proportional to 20,609,920.40, 30,928,877.40 and 11,512,000.40

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Solution

The fourth proportional to 20,609,920.40, 30,928,877.40 and 11,512,000.40 is: 17,275,818.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,609,920.40 : 30,928,877.40 = 11,512,000.40 : x
  2. Step 2: Convert to fraction form
    20,609,920.40/30,928,877.40 = 11,512,000.40/x
  3. Step 3: Cross multiply
    20,609,920.40x = 30,928,877.40 × 11,512,000.40
  4. Step 4: Simplify right side
    20,609,920.40x = 356,053,249,000,350.94
  5. Step 5: Solve for x
    x = 356,053,249,000,350.94/20,609,920.40
  6. Step 6: Final answer
    x = 17,275,818.74

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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.