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Finding the Fourth Proportional to 2,613.98, 3,920.92 and 639.62

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Solution

The fourth proportional to 2,613.98, 3,920.92 and 639.62 is: 959.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.98 : 3,920.92 = 639.62 : x
  2. Step 2: Convert to fraction form
    2,613.98/3,920.92 = 639.62/x
  3. Step 3: Cross multiply
    2,613.98x = 3,920.92 × 639.62
  4. Step 4: Simplify right side
    2,613.98x = 2,507,898.85
  5. Step 5: Solve for x
    x = 2,507,898.85/2,613.98
  6. Step 6: Final answer
    x = 959.42

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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.