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Finding the Fourth Proportional to 81,609.94, 122,400.84 and 21,638.84

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Solution

The fourth proportional to 81,609.94, 122,400.84 and 21,638.84 is: 32,454.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,609.94 : 122,400.84 = 21,638.84 : x
  2. Step 2: Convert to fraction form
    81,609.94/122,400.84 = 21,638.84/x
  3. Step 3: Cross multiply
    81,609.94x = 122,400.84 × 21,638.84
  4. Step 4: Simplify right side
    81,609.94x = 2,648,612,192.63
  5. Step 5: Solve for x
    x = 2,648,612,192.63/81,609.94
  6. Step 6: Final answer
    x = 32,454.53

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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.