Home / 100,102.72-138,081.73-66,111.28

Finding the Fourth Proportional to 100,102.72, 138,081.73 and 66,111.28

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Solution

The fourth proportional to 100,102.72, 138,081.73 and 66,111.28 is: 91,193.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,102.72 : 138,081.73 = 66,111.28 : x
  2. Step 2: Convert to fraction form
    100,102.72/138,081.73 = 66,111.28/x
  3. Step 3: Cross multiply
    100,102.72x = 138,081.73 × 66,111.28
  4. Step 4: Simplify right side
    100,102.72x = 9,128,759,914.91
  5. Step 5: Solve for x
    x = 9,128,759,914.91/100,102.72
  6. Step 6: Final answer
    x = 91,193.92

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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.