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Finding the Fourth Proportional to 2,189.81, 3,285.15 and 709.43

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Solution

The fourth proportional to 2,189.81, 3,285.15 and 709.43 is: 1,064.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.81 : 3,285.15 = 709.43 : x
  2. Step 2: Convert to fraction form
    2,189.81/3,285.15 = 709.43/x
  3. Step 3: Cross multiply
    2,189.81x = 3,285.15 × 709.43
  4. Step 4: Simplify right side
    2,189.81x = 2,330,583.96
  5. Step 5: Solve for x
    x = 2,330,583.96/2,189.81
  6. Step 6: Final answer
    x = 1,064.29

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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.