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Finding the Fourth Proportional to 1,659.13, 2,489.36 and 685

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Solution

The fourth proportional to 1,659.13, 2,489.36 and 685 is: 1,027.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.13 : 2,489.36 = 685 : x
  2. Step 2: Convert to fraction form
    1,659.13/2,489.36 = 685/x
  3. Step 3: Cross multiply
    1,659.13x = 2,489.36 × 685
  4. Step 4: Simplify right side
    1,659.13x = 1,705,211.60
  5. Step 5: Solve for x
    x = 1,705,211.60/1,659.13
  6. Step 6: Final answer
    x = 1,027.77

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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.