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Finding the Fourth Proportional to 78,659.88, 117,991.02 and 28,750.08

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Solution

The fourth proportional to 78,659.88, 117,991.02 and 28,750.08 is: 43,125.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,659.88 : 117,991.02 = 28,750.08 : x
  2. Step 2: Convert to fraction form
    78,659.88/117,991.02 = 28,750.08/x
  3. Step 3: Cross multiply
    78,659.88x = 117,991.02 × 28,750.08
  4. Step 4: Simplify right side
    78,659.88x = 3,392,251,264.28
  5. Step 5: Solve for x
    x = 3,392,251,264.28/78,659.88
  6. Step 6: Final answer
    x = 43,125.56

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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.