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Finding the Fourth Proportional to 2,613.20, 3,919.77 and 665.55

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Solution

The fourth proportional to 2,613.20, 3,919.77 and 665.55 is: 998.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.20 : 3,919.77 = 665.55 : x
  2. Step 2: Convert to fraction form
    2,613.20/3,919.77 = 665.55/x
  3. Step 3: Cross multiply
    2,613.20x = 3,919.77 × 665.55
  4. Step 4: Simplify right side
    2,613.20x = 2,608,802.92
  5. Step 5: Solve for x
    x = 2,608,802.92/2,613.20
  6. Step 6: Final answer
    x = 998.32

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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.