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Finding the Fourth Proportional to 18,768.68, 28,151.19 and 4,917.68

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Solution

The fourth proportional to 18,768.68, 28,151.19 and 4,917.68 is: 7,376.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,768.68 : 28,151.19 = 4,917.68 : x
  2. Step 2: Convert to fraction form
    18,768.68/28,151.19 = 4,917.68/x
  3. Step 3: Cross multiply
    18,768.68x = 28,151.19 × 4,917.68
  4. Step 4: Simplify right side
    18,768.68x = 138,438,403.28
  5. Step 5: Solve for x
    x = 138,438,403.28/18,768.68
  6. Step 6: Final answer
    x = 7,376.03

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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.