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Finding the Fourth Proportional to 81,810.39, 122,751.53 and 39,722.79

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Solution

The fourth proportional to 81,810.39, 122,751.53 and 39,722.79 is: 59,601.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,810.39 : 122,751.53 = 39,722.79 : x
  2. Step 2: Convert to fraction form
    81,810.39/122,751.53 = 39,722.79/x
  3. Step 3: Cross multiply
    81,810.39x = 122,751.53 × 39,722.79
  4. Step 4: Simplify right side
    81,810.39x = 4,876,033,248.37
  5. Step 5: Solve for x
    x = 4,876,033,248.37/81,810.39
  6. Step 6: Final answer
    x = 59,601.64

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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.