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Finding the Fourth Proportional to 81,447.60, 122,128.20 and 28,858.80

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Solution

The fourth proportional to 81,447.60, 122,128.20 and 28,858.80 is: 43,272.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,447.60 : 122,128.20 = 28,858.80 : x
  2. Step 2: Convert to fraction form
    81,447.60/122,128.20 = 28,858.80/x
  3. Step 3: Cross multiply
    81,447.60x = 122,128.20 × 28,858.80
  4. Step 4: Simplify right side
    81,447.60x = 3,524,473,298.16
  5. Step 5: Solve for x
    x = 3,524,473,298.16/81,447.60
  6. Step 6: Final answer
    x = 43,272.89

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1.5x scale

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.