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Finding the Fourth Proportional to 21,759.87, 30,028.60 and 12,328.42

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Solution

The fourth proportional to 21,759.87, 30,028.60 and 12,328.42 is: 17,013.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,759.87 : 30,028.60 = 12,328.42 : x
  2. Step 2: Convert to fraction form
    21,759.87/30,028.60 = 12,328.42/x
  3. Step 3: Cross multiply
    21,759.87x = 30,028.60 × 12,328.42
  4. Step 4: Simplify right side
    21,759.87x = 370,205,192.81
  5. Step 5: Solve for x
    x = 370,205,192.81/21,759.87
  6. Step 6: Final answer
    x = 17,013.21

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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.