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Finding the Fourth Proportional to 3,859.99, 5,326.80 and 2,091.59

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Solution

The fourth proportional to 3,859.99, 5,326.80 and 2,091.59 is: 2,886.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,859.99 : 5,326.80 = 2,091.59 : x
  2. Step 2: Convert to fraction form
    3,859.99/5,326.80 = 2,091.59/x
  3. Step 3: Cross multiply
    3,859.99x = 5,326.80 × 2,091.59
  4. Step 4: Simplify right side
    3,859.99x = 11,141,481.61
  5. Step 5: Solve for x
    x = 11,141,481.61/3,859.99
  6. Step 6: Final answer
    x = 2,886.40

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.