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Finding the Fourth Proportional to 21,007.27, 28,990.70 and 12,056.41

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Solution

The fourth proportional to 21,007.27, 28,990.70 and 12,056.41 is: 16,638.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.27 : 28,990.70 = 12,056.41 : x
  2. Step 2: Convert to fraction form
    21,007.27/28,990.70 = 12,056.41/x
  3. Step 3: Cross multiply
    21,007.27x = 28,990.70 × 12,056.41
  4. Step 4: Simplify right side
    21,007.27x = 349,523,765.39
  5. Step 5: Solve for x
    x = 349,523,765.39/21,007.27
  6. Step 6: Final answer
    x = 16,638.23

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.