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Finding the Fourth Proportional to 18,771.72, 28,157.04 and 4,731.72

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Solution

The fourth proportional to 18,771.72, 28,157.04 and 4,731.72 is: 7,097.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,771.72 : 28,157.04 = 4,731.72 : x
  2. Step 2: Convert to fraction form
    18,771.72/28,157.04 = 4,731.72/x
  3. Step 3: Cross multiply
    18,771.72x = 28,157.04 × 4,731.72
  4. Step 4: Simplify right side
    18,771.72x = 133,231,229.31
  5. Step 5: Solve for x
    x = 133,231,229.31/18,771.72
  6. Step 6: Final answer
    x = 7,097.44

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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.