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Finding the Fourth Proportional to 12,290.88, 16,961.88 and 6,985.92

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Solution

The fourth proportional to 12,290.88, 16,961.88 and 6,985.92 is: 9,640.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,290.88 : 16,961.88 = 6,985.92 : x
  2. Step 2: Convert to fraction form
    12,290.88/16,961.88 = 6,985.92/x
  3. Step 3: Cross multiply
    12,290.88x = 16,961.88 × 6,985.92
  4. Step 4: Simplify right side
    12,290.88x = 118,494,336.73
  5. Step 5: Solve for x
    x = 118,494,336.73/12,290.88
  6. Step 6: Final answer
    x = 9,640.83

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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.