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Finding the Fourth Proportional to 81,989.60, 122,984.40 and 52,440.80

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Solution

The fourth proportional to 81,989.60, 122,984.40 and 52,440.80 is: 78,661.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,989.60 : 122,984.40 = 52,440.80 : x
  2. Step 2: Convert to fraction form
    81,989.60/122,984.40 = 52,440.80/x
  3. Step 3: Cross multiply
    81,989.60x = 122,984.40 × 52,440.80
  4. Step 4: Simplify right side
    81,989.60x = 6,449,400,323.52
  5. Step 5: Solve for x
    x = 6,449,400,323.52/81,989.60
  6. Step 6: Final answer
    x = 78,661.20

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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.