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Finding the Fourth Proportional to 20,652,110.10, 30,978,165.15 and 18,420,057.90

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Solution

The fourth proportional to 20,652,110.10, 30,978,165.15 and 18,420,057.90 is: 27,630,086.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,652,110.10 : 30,978,165.15 = 18,420,057.90 : x
  2. Step 2: Convert to fraction form
    20,652,110.10/30,978,165.15 = 18,420,057.90/x
  3. Step 3: Cross multiply
    20,652,110.10x = 30,978,165.15 × 18,420,057.90
  4. Step 4: Simplify right side
    20,652,110.10x = 570,619,595,698,762.12
  5. Step 5: Solve for x
    x = 570,619,595,698,762.12/20,652,110.10
  6. Step 6: Final answer
    x = 27,630,086.85

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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.