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Finding the Fourth Proportional to 2,612.62, 3,918.91 and 664.81

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Solution

The fourth proportional to 2,612.62, 3,918.91 and 664.81 is: 997.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612.62 : 3,918.91 = 664.81 : x
  2. Step 2: Convert to fraction form
    2,612.62/3,918.91 = 664.81/x
  3. Step 3: Cross multiply
    2,612.62x = 3,918.91 × 664.81
  4. Step 4: Simplify right side
    2,612.62x = 2,605,309.30
  5. Step 5: Solve for x
    x = 2,605,309.30/2,612.62
  6. Step 6: Final answer
    x = 997.20

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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.