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Finding the Fourth Proportional to 126,090.60, 188,886.30 and 81,748.20

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Solution

The fourth proportional to 126,090.60, 188,886.30 and 81,748.20 is: 122,460.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,090.60 : 188,886.30 = 81,748.20 : x
  2. Step 2: Convert to fraction form
    126,090.60/188,886.30 = 81,748.20/x
  3. Step 3: Cross multiply
    126,090.60x = 188,886.30 × 81,748.20
  4. Step 4: Simplify right side
    126,090.60x = 15,441,115,029.66
  5. Step 5: Solve for x
    x = 15,441,115,029.66/126,090.60
  6. Step 6: Final answer
    x = 122,460.48

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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.