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Finding the Fourth Proportional to 81,459.29, 122,188.69 and 20,669.44

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Solution

The fourth proportional to 81,459.29, 122,188.69 and 20,669.44 is: 31,004.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,459.29 : 122,188.69 = 20,669.44 : x
  2. Step 2: Convert to fraction form
    81,459.29/122,188.69 = 20,669.44/x
  3. Step 3: Cross multiply
    81,459.29x = 122,188.69 × 20,669.44
  4. Step 4: Simplify right side
    81,459.29x = 2,525,571,746.10
  5. Step 5: Solve for x
    x = 2,525,571,746.10/81,459.29
  6. Step 6: Final answer
    x = 31,004.10

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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.