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Finding the Fourth Proportional to 21,912.40, 32,917.20 and 21,026.80

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Solution

The fourth proportional to 21,912.40, 32,917.20 and 21,026.80 is: 31,586.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,912.40 : 32,917.20 = 21,026.80 : x
  2. Step 2: Convert to fraction form
    21,912.40/32,917.20 = 21,026.80/x
  3. Step 3: Cross multiply
    21,912.40x = 32,917.20 × 21,026.80
  4. Step 4: Simplify right side
    21,912.40x = 692,143,380.96
  5. Step 5: Solve for x
    x = 692,143,380.96/21,912.40
  6. Step 6: Final answer
    x = 31,586.84

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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.