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Finding the Fourth Proportional to 81,369.69, 122,054.93 and 28,779.22

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Solution

The fourth proportional to 81,369.69, 122,054.93 and 28,779.22 is: 43,168.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,369.69 : 122,054.93 = 28,779.22 : x
  2. Step 2: Convert to fraction form
    81,369.69/122,054.93 = 28,779.22/x
  3. Step 3: Cross multiply
    81,369.69x = 122,054.93 × 28,779.22
  4. Step 4: Simplify right side
    81,369.69x = 3,512,645,682.55
  5. Step 5: Solve for x
    x = 3,512,645,682.55/81,369.69
  6. Step 6: Final answer
    x = 43,168.97

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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.