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Finding the Fourth Proportional to 2,191.70, 3,288.45 and 805.70

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Solution

The fourth proportional to 2,191.70, 3,288.45 and 805.70 is: 1,208.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,191.70 : 3,288.45 = 805.70 : x
  2. Step 2: Convert to fraction form
    2,191.70/3,288.45 = 805.70/x
  3. Step 3: Cross multiply
    2,191.70x = 3,288.45 × 805.70
  4. Step 4: Simplify right side
    2,191.70x = 2,649,504.17
  5. Step 5: Solve for x
    x = 2,649,504.17/2,191.70
  6. Step 6: Final answer
    x = 1,208.88

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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.