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Finding the Fourth Proportional to 6,661.89, 9,992.83 and 1,981.88

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Solution

The fourth proportional to 6,661.89, 9,992.83 and 1,981.88 is: 2,972.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,661.89 : 9,992.83 = 1,981.88 : x
  2. Step 2: Convert to fraction form
    6,661.89/9,992.83 = 1,981.88/x
  3. Step 3: Cross multiply
    6,661.89x = 9,992.83 × 1,981.88
  4. Step 4: Simplify right side
    6,661.89x = 19,804,609.95
  5. Step 5: Solve for x
    x = 19,804,609.95/6,661.89
  6. Step 6: Final answer
    x = 2,972.82

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.