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Finding the Fourth Proportional to 1,609.42, 2,221.03 and 979.97

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Solution

The fourth proportional to 1,609.42, 2,221.03 and 979.97 is: 1,352.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.42 : 2,221.03 = 979.97 : x
  2. Step 2: Convert to fraction form
    1,609.42/2,221.03 = 979.97/x
  3. Step 3: Cross multiply
    1,609.42x = 2,221.03 × 979.97
  4. Step 4: Simplify right side
    1,609.42x = 2,176,553.01
  5. Step 5: Solve for x
    x = 2,176,553.01/1,609.42
  6. Step 6: Final answer
    x = 1,352.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.