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Finding the Fourth Proportional to 21,757.68, 30,025.20 and 11,821.68

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Solution

The fourth proportional to 21,757.68, 30,025.20 and 11,821.68 is: 16,313.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,757.68 : 30,025.20 = 11,821.68 : x
  2. Step 2: Convert to fraction form
    21,757.68/30,025.20 = 11,821.68/x
  3. Step 3: Cross multiply
    21,757.68x = 30,025.20 × 11,821.68
  4. Step 4: Simplify right side
    21,757.68x = 354,948,306.34
  5. Step 5: Solve for x
    x = 354,948,306.34/21,757.68
  6. Step 6: Final answer
    x = 16,313.70

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1.5x scale

Why These Related Problems?

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