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Finding the Fourth Proportional to 77,067, 115,600.50 and 18,699

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Solution

The fourth proportional to 77,067, 115,600.50 and 18,699 is: 28,048.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,067 : 115,600.50 = 18,699 : x
  2. Step 2: Convert to fraction form
    77,067/115,600.50 = 18,699/x
  3. Step 3: Cross multiply
    77,067x = 115,600.50 × 18,699
  4. Step 4: Simplify right side
    77,067x = 2,161,613,749.50
  5. Step 5: Solve for x
    x = 2,161,613,749.50/77,067
  6. Step 6: Final answer
    x = 28,048.50

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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.