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Finding the Fourth Proportional to 3,859.40, 5,789.10 and 1,394.30

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Solution

The fourth proportional to 3,859.40, 5,789.10 and 1,394.30 is: 2,091.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,859.40 : 5,789.10 = 1,394.30 : x
  2. Step 2: Convert to fraction form
    3,859.40/5,789.10 = 1,394.30/x
  3. Step 3: Cross multiply
    3,859.40x = 5,789.10 × 1,394.30
  4. Step 4: Simplify right side
    3,859.40x = 8,071,742.13
  5. Step 5: Solve for x
    x = 8,071,742.13/3,859.40
  6. Step 6: Final answer
    x = 2,091.45

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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.