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Finding the Fourth Proportional to 2,613.81, 3,920.69 and 665.99

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Solution

The fourth proportional to 2,613.81, 3,920.69 and 665.99 is: 998.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.81 : 3,920.69 = 665.99 : x
  2. Step 2: Convert to fraction form
    2,613.81/3,920.69 = 665.99/x
  3. Step 3: Cross multiply
    2,613.81x = 3,920.69 × 665.99
  4. Step 4: Simplify right side
    2,613.81x = 2,611,151.80
  5. Step 5: Solve for x
    x = 2,611,151.80/2,613.81
  6. Step 6: Final answer
    x = 998.98

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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.