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Finding the Fourth Proportional to 21,759.50, 30,028.14 and 12,328.70

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Solution

The fourth proportional to 21,759.50, 30,028.14 and 12,328.70 is: 17,013.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,759.50 : 30,028.14 = 12,328.70 : x
  2. Step 2: Convert to fraction form
    21,759.50/30,028.14 = 12,328.70/x
  3. Step 3: Cross multiply
    21,759.50x = 30,028.14 × 12,328.70
  4. Step 4: Simplify right side
    21,759.50x = 370,207,929.62
  5. Step 5: Solve for x
    x = 370,207,929.62/21,759.50
  6. Step 6: Final answer
    x = 17,013.62

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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.