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Finding the Fourth Proportional to 123,242.09, 170,074.09 and 66,653.47

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Solution

The fourth proportional to 123,242.09, 170,074.09 and 66,653.47 is: 91,981.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,242.09 : 170,074.09 = 66,653.47 : x
  2. Step 2: Convert to fraction form
    123,242.09/170,074.09 = 66,653.47/x
  3. Step 3: Cross multiply
    123,242.09x = 170,074.09 × 66,653.47
  4. Step 4: Simplify right side
    123,242.09x = 11,336,028,043.00
  5. Step 5: Solve for x
    x = 11,336,028,043.00/123,242.09
  6. Step 6: Final answer
    x = 91,981.79

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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.