Home / 78,081.12-117,129.54-21,921.36

Finding the Fourth Proportional to 78,081.12, 117,129.54 and 21,921.36

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Solution

The fourth proportional to 78,081.12, 117,129.54 and 21,921.36 is: 32,884.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,081.12 : 117,129.54 = 21,921.36 : x
  2. Step 2: Convert to fraction form
    78,081.12/117,129.54 = 21,921.36/x
  3. Step 3: Cross multiply
    78,081.12x = 117,129.54 × 21,921.36
  4. Step 4: Simplify right side
    78,081.12x = 2,567,638,812.97
  5. Step 5: Solve for x
    x = 2,567,638,812.97/78,081.12
  6. Step 6: Final answer
    x = 32,884.25

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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.