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Finding the Fourth Proportional to 81,735.92, 122,689.80 and 72,435.44

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Solution

The fourth proportional to 81,735.92, 122,689.80 and 72,435.44 is: 108,729.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,735.92 : 122,689.80 = 72,435.44 : x
  2. Step 2: Convert to fraction form
    81,735.92/122,689.80 = 72,435.44/x
  3. Step 3: Cross multiply
    81,735.92x = 122,689.80 × 72,435.44
  4. Step 4: Simplify right side
    81,735.92x = 8,887,089,646.51
  5. Step 5: Solve for x
    x = 8,887,089,646.51/81,735.92
  6. Step 6: Final answer
    x = 108,729.30

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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.