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Finding the Fourth Proportional to 15,911.88, 21,957.96 and 8,838.12

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Solution

The fourth proportional to 15,911.88, 21,957.96 and 8,838.12 is: 12,196.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,911.88 : 21,957.96 = 8,838.12 : x
  2. Step 2: Convert to fraction form
    15,911.88/21,957.96 = 8,838.12/x
  3. Step 3: Cross multiply
    15,911.88x = 21,957.96 × 8,838.12
  4. Step 4: Simplify right side
    15,911.88x = 194,067,085.44
  5. Step 5: Solve for x
    x = 194,067,085.44/15,911.88
  6. Step 6: Final answer
    x = 12,196.36

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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.