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Finding the Fourth Proportional to 15,193.20, 20,966.56 and 8,478.76

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Solution

The fourth proportional to 15,193.20, 20,966.56 and 8,478.76 is: 11,700.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,193.20 : 20,966.56 = 8,478.76 : x
  2. Step 2: Convert to fraction form
    15,193.20/20,966.56 = 8,478.76/x
  3. Step 3: Cross multiply
    15,193.20x = 20,966.56 × 8,478.76
  4. Step 4: Simplify right side
    15,193.20x = 177,770,430.27
  5. Step 5: Solve for x
    x = 177,770,430.27/15,193.20
  6. Step 6: Final answer
    x = 11,700.66

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Double scale
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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.