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Finding the Fourth Proportional to 13,751,926.64, 18,978,249.20 and 7,640,355.12

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Solution

The fourth proportional to 13,751,926.64, 18,978,249.20 and 7,640,355.12 is: 10,544,018.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,751,926.64 : 18,978,249.20 = 7,640,355.12 : x
  2. Step 2: Convert to fraction form
    13,751,926.64/18,978,249.20 = 7,640,355.12/x
  3. Step 3: Cross multiply
    13,751,926.64x = 18,978,249.20 × 7,640,355.12
  4. Step 4: Simplify right side
    13,751,926.64x = 145,000,563,443,855.91
  5. Step 5: Solve for x
    x = 145,000,563,443,855.91/13,751,926.64
  6. Step 6: Final answer
    x = 10,544,018.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.