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Finding the Fourth Proportional to 81,419.60, 122,129.40 and 28,811.60

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Solution

The fourth proportional to 81,419.60, 122,129.40 and 28,811.60 is: 43,217.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,419.60 : 122,129.40 = 28,811.60 : x
  2. Step 2: Convert to fraction form
    81,419.60/122,129.40 = 28,811.60/x
  3. Step 3: Cross multiply
    81,419.60x = 122,129.40 × 28,811.60
  4. Step 4: Simplify right side
    81,419.60x = 3,518,743,421.04
  5. Step 5: Solve for x
    x = 3,518,743,421.04/81,419.60
  6. Step 6: Final answer
    x = 43,217.40

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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.