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Finding the Fourth Proportional to 18,871,651.80, 28,265,487.30 and 15,512,419.80

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Solution

The fourth proportional to 18,871,651.80, 28,265,487.30 and 15,512,419.80 is: 23,234,113.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871,651.80 : 28,265,487.30 = 15,512,419.80 : x
  2. Step 2: Convert to fraction form
    18,871,651.80/28,265,487.30 = 15,512,419.80/x
  3. Step 3: Cross multiply
    18,871,651.80x = 28,265,487.30 × 15,512,419.80
  4. Step 4: Simplify right side
    18,871,651.80x = 438,466,104,849,168.56
  5. Step 5: Solve for x
    x = 438,466,104,849,168.56/18,871,651.80
  6. Step 6: Final answer
    x = 23,234,113.76

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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.