Home / 78,581.88-117,890.64-25,991.28

Finding the Fourth Proportional to 78,581.88, 117,890.64 and 25,991.28

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Solution

The fourth proportional to 78,581.88, 117,890.64 and 25,991.28 is: 38,992.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,581.88 : 117,890.64 = 25,991.28 : x
  2. Step 2: Convert to fraction form
    78,581.88/117,890.64 = 25,991.28/x
  3. Step 3: Cross multiply
    78,581.88x = 117,890.64 × 25,991.28
  4. Step 4: Simplify right side
    78,581.88x = 3,064,128,633.62
  5. Step 5: Solve for x
    x = 3,064,128,633.62/78,581.88
  6. Step 6: Final answer
    x = 38,992.81

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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.