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Finding the Fourth Proportional to 2,613.74, 3,920.60 and 639.38

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Solution

The fourth proportional to 2,613.74, 3,920.60 and 639.38 is: 959.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,613.74 : 3,920.60 = 639.38 : x
  2. Step 2: Convert to fraction form
    2,613.74/3,920.60 = 639.38/x
  3. Step 3: Cross multiply
    2,613.74x = 3,920.60 × 639.38
  4. Step 4: Simplify right side
    2,613.74x = 2,506,759.83
  5. Step 5: Solve for x
    x = 2,506,759.83/2,613.74
  6. Step 6: Final answer
    x = 959.07

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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.