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Finding the Fourth Proportional to 18,830.63, 28,245.93 and 7,143.84

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Solution

The fourth proportional to 18,830.63, 28,245.93 and 7,143.84 is: 10,715.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,830.63 : 28,245.93 = 7,143.84 : x
  2. Step 2: Convert to fraction form
    18,830.63/28,245.93 = 7,143.84/x
  3. Step 3: Cross multiply
    18,830.63x = 28,245.93 × 7,143.84
  4. Step 4: Simplify right side
    18,830.63x = 201,784,404.57
  5. Step 5: Solve for x
    x = 201,784,404.57/18,830.63
  6. Step 6: Final answer
    x = 10,715.75

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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.