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Finding the Fourth Proportional to 15,793.78, 21,795.24 and 8,720.02

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Solution

The fourth proportional to 15,793.78, 21,795.24 and 8,720.02 is: 12,033.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,793.78 : 21,795.24 = 8,720.02 : x
  2. Step 2: Convert to fraction form
    15,793.78/21,795.24 = 8,720.02/x
  3. Step 3: Cross multiply
    15,793.78x = 21,795.24 × 8,720.02
  4. Step 4: Simplify right side
    15,793.78x = 190,054,928.70
  5. Step 5: Solve for x
    x = 190,054,928.70/15,793.78
  6. Step 6: Final answer
    x = 12,033.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.