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Finding the Fourth Proportional to 2,608.97, 3,913.58 and 661.19

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Solution

The fourth proportional to 2,608.97, 3,913.58 and 661.19 is: 991.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,608.97 : 3,913.58 = 661.19 : x
  2. Step 2: Convert to fraction form
    2,608.97/3,913.58 = 661.19/x
  3. Step 3: Cross multiply
    2,608.97x = 3,913.58 × 661.19
  4. Step 4: Simplify right side
    2,608.97x = 2,587,602.05
  5. Step 5: Solve for x
    x = 2,587,602.05/2,608.97
  6. Step 6: Final answer
    x = 991.81

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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.