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Finding the Fourth Proportional to 15,696.96, 21,660.36 and 8,981.40

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Solution

The fourth proportional to 15,696.96, 21,660.36 and 8,981.40 is: 12,393.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,696.96 : 21,660.36 = 8,981.40 : x
  2. Step 2: Convert to fraction form
    15,696.96/21,660.36 = 8,981.40/x
  3. Step 3: Cross multiply
    15,696.96x = 21,660.36 × 8,981.40
  4. Step 4: Simplify right side
    15,696.96x = 194,540,357.30
  5. Step 5: Solve for x
    x = 194,540,357.30/15,696.96
  6. Step 6: Final answer
    x = 12,393.51

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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.