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Finding the Fourth Proportional to 1,659.72, 2,489.49 and 427.20

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Solution

The fourth proportional to 1,659.72, 2,489.49 and 427.20 is: 640.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.72 : 2,489.49 = 427.20 : x
  2. Step 2: Convert to fraction form
    1,659.72/2,489.49 = 427.20/x
  3. Step 3: Cross multiply
    1,659.72x = 2,489.49 × 427.20
  4. Step 4: Simplify right side
    1,659.72x = 1,063,497.68
  5. Step 5: Solve for x
    x = 1,063,497.68/1,659.72
  6. Step 6: Final answer
    x = 640.77

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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.