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Finding the Fourth Proportional to 18,975.79, 28,469.76 and 9,115.76

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Solution

The fourth proportional to 18,975.79, 28,469.76 and 9,115.76 is: 13,676.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,975.79 : 28,469.76 = 9,115.76 : x
  2. Step 2: Convert to fraction form
    18,975.79/28,469.76 = 9,115.76/x
  3. Step 3: Cross multiply
    18,975.79x = 28,469.76 × 9,115.76
  4. Step 4: Simplify right side
    18,975.79x = 259,523,570.59
  5. Step 5: Solve for x
    x = 259,523,570.59/18,975.79
  6. Step 6: Final answer
    x = 13,676.56

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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.