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Finding the Fourth Proportional to 81,720.60, 122,580.90 and 29,111.10

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Solution

The fourth proportional to 81,720.60, 122,580.90 and 29,111.10 is: 43,666.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,720.60 : 122,580.90 = 29,111.10 : x
  2. Step 2: Convert to fraction form
    81,720.60/122,580.90 = 29,111.10/x
  3. Step 3: Cross multiply
    81,720.60x = 122,580.90 × 29,111.10
  4. Step 4: Simplify right side
    81,720.60x = 3,568,464,837.99
  5. Step 5: Solve for x
    x = 3,568,464,837.99/81,720.60
  6. Step 6: Final answer
    x = 43,666.65

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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.