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Finding the Fourth Proportional to 100,770.72, 138,917.76 and 66,722.08

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Solution

The fourth proportional to 100,770.72, 138,917.76 and 66,722.08 is: 91,979.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,770.72 : 138,917.76 = 66,722.08 : x
  2. Step 2: Convert to fraction form
    100,770.72/138,917.76 = 66,722.08/x
  3. Step 3: Cross multiply
    100,770.72x = 138,917.76 × 66,722.08
  4. Step 4: Simplify right side
    100,770.72x = 9,268,881,896.14
  5. Step 5: Solve for x
    x = 9,268,881,896.14/100,770.72
  6. Step 6: Final answer
    x = 91,979.91

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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.