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Finding the Fourth Proportional to 15,912.20, 21,957.90 and 8,838.20

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Solution

The fourth proportional to 15,912.20, 21,957.90 and 8,838.20 is: 12,196.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,912.20 : 21,957.90 = 8,838.20 : x
  2. Step 2: Convert to fraction form
    15,912.20/21,957.90 = 8,838.20/x
  3. Step 3: Cross multiply
    15,912.20x = 21,957.90 × 8,838.20
  4. Step 4: Simplify right side
    15,912.20x = 194,068,311.78
  5. Step 5: Solve for x
    x = 194,068,311.78/15,912.20
  6. Step 6: Final answer
    x = 12,196.20

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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.