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Finding the Fourth Proportional to 15,793.92, 21,795.56 and 8,720.28

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Solution

The fourth proportional to 15,793.92, 21,795.56 and 8,720.28 is: 12,033.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,793.92 : 21,795.56 = 8,720.28 : x
  2. Step 2: Convert to fraction form
    15,793.92/21,795.56 = 8,720.28/x
  3. Step 3: Cross multiply
    15,793.92x = 21,795.56 × 8,720.28
  4. Step 4: Simplify right side
    15,793.92x = 190,063,385.96
  5. Step 5: Solve for x
    x = 190,063,385.96/15,793.92
  6. Step 6: Final answer
    x = 12,033.96

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1.5x scale

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.