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Finding the Fourth Proportional to 69,338.17, 103,991.19 and 19,421.79

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Solution

The fourth proportional to 69,338.17, 103,991.19 and 19,421.79 is: 29,128.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,338.17 : 103,991.19 = 19,421.79 : x
  2. Step 2: Convert to fraction form
    69,338.17/103,991.19 = 19,421.79/x
  3. Step 3: Cross multiply
    69,338.17x = 103,991.19 × 19,421.79
  4. Step 4: Simplify right side
    69,338.17x = 2,019,695,054.03
  5. Step 5: Solve for x
    x = 2,019,695,054.03/69,338.17
  6. Step 6: Final answer
    x = 29,128.19

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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.