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Finding the Fourth Proportional to 81,339.90, 121,998.60 and 25,218.60

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Solution

The fourth proportional to 81,339.90, 121,998.60 and 25,218.60 is: 37,824.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,339.90 : 121,998.60 = 25,218.60 : x
  2. Step 2: Convert to fraction form
    81,339.90/121,998.60 = 25,218.60/x
  3. Step 3: Cross multiply
    81,339.90x = 121,998.60 × 25,218.60
  4. Step 4: Simplify right side
    81,339.90x = 3,076,633,893.96
  5. Step 5: Solve for x
    x = 3,076,633,893.96/81,339.90
  6. Step 6: Final answer
    x = 37,824.41

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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.