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Finding the Fourth Proportional to 2,609.22, 3,913.97 and 661.44

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Solution

The fourth proportional to 2,609.22, 3,913.97 and 661.44 is: 992.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,609.22 : 3,913.97 = 661.44 : x
  2. Step 2: Convert to fraction form
    2,609.22/3,913.97 = 661.44/x
  3. Step 3: Cross multiply
    2,609.22x = 3,913.97 × 661.44
  4. Step 4: Simplify right side
    2,609.22x = 2,588,833.44
  5. Step 5: Solve for x
    x = 2,588,833.44/2,609.22
  6. Step 6: Final answer
    x = 992.19

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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.