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Finding the Fourth Proportional to 20,314.40, 30,428.40 and 16,858.40

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Solution

The fourth proportional to 20,314.40, 30,428.40 and 16,858.40 is: 25,251.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,314.40 : 30,428.40 = 16,858.40 : x
  2. Step 2: Convert to fraction form
    20,314.40/30,428.40 = 16,858.40/x
  3. Step 3: Cross multiply
    20,314.40x = 30,428.40 × 16,858.40
  4. Step 4: Simplify right side
    20,314.40x = 512,974,138.56
  5. Step 5: Solve for x
    x = 512,974,138.56/20,314.40
  6. Step 6: Final answer
    x = 25,251.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.