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Finding the Fourth Proportional to 18,971.55, 28,455.09 and 11,930.79

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Solution

The fourth proportional to 18,971.55, 28,455.09 and 11,930.79 is: 17,894.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.55 : 28,455.09 = 11,930.79 : x
  2. Step 2: Convert to fraction form
    18,971.55/28,455.09 = 11,930.79/x
  3. Step 3: Cross multiply
    18,971.55x = 28,455.09 × 11,930.79
  4. Step 4: Simplify right side
    18,971.55x = 339,491,703.22
  5. Step 5: Solve for x
    x = 339,491,703.22/18,971.55
  6. Step 6: Final answer
    x = 17,894.78

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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.