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Finding the Fourth Proportional to 21,757.68, 30,028.32 and 12,329.28

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Solution

The fourth proportional to 21,757.68, 30,028.32 and 12,329.28 is: 17,015.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,757.68 : 30,028.32 = 12,329.28 : x
  2. Step 2: Convert to fraction form
    21,757.68/30,028.32 = 12,329.28/x
  3. Step 3: Cross multiply
    21,757.68x = 30,028.32 × 12,329.28
  4. Step 4: Simplify right side
    21,757.68x = 370,227,565.21
  5. Step 5: Solve for x
    x = 370,227,565.21/21,757.68
  6. Step 6: Final answer
    x = 17,015.95

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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.