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Finding the Fourth Proportional to 18,768.78, 28,153.38 and 4,917.78

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Solution

The fourth proportional to 18,768.78, 28,153.38 and 4,917.78 is: 7,376.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,768.78 : 28,153.38 = 4,917.78 : x
  2. Step 2: Convert to fraction form
    18,768.78/28,153.38 = 4,917.78/x
  3. Step 3: Cross multiply
    18,768.78x = 28,153.38 × 4,917.78
  4. Step 4: Simplify right side
    18,768.78x = 138,452,129.10
  5. Step 5: Solve for x
    x = 138,452,129.10/18,768.78
  6. Step 6: Final answer
    x = 7,376.73

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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.