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Finding the Fourth Proportional to 81,720.55, 122,580.82 and 29,093.12

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Solution

The fourth proportional to 81,720.55, 122,580.82 and 29,093.12 is: 43,639.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,720.55 : 122,580.82 = 29,093.12 : x
  2. Step 2: Convert to fraction form
    81,720.55/122,580.82 = 29,093.12/x
  3. Step 3: Cross multiply
    81,720.55x = 122,580.82 × 29,093.12
  4. Step 4: Simplify right side
    81,720.55x = 3,566,258,505.96
  5. Step 5: Solve for x
    x = 3,566,258,505.96/81,720.55
  6. Step 6: Final answer
    x = 43,639.68

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Similar ratio
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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.