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Finding the Fourth Proportional to 18,686,021.20, 28,029,031.80 and 18,686,021.20

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Solution

The fourth proportional to 18,686,021.20, 28,029,031.80 and 18,686,021.20 is: 28,029,031.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686,021.20 : 28,029,031.80 = 18,686,021.20 : x
  2. Step 2: Convert to fraction form
    18,686,021.20/28,029,031.80 = 18,686,021.20/x
  3. Step 3: Cross multiply
    18,686,021.20x = 28,029,031.80 × 18,686,021.20
  4. Step 4: Simplify right side
    18,686,021.20x = 523,751,082,430,274.12
  5. Step 5: Solve for x
    x = 523,751,082,430,274.12/18,686,021.20
  6. Step 6: Final answer
    x = 28,029,031.80

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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.