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Finding the Fourth Proportional to 1,613.69, 2,418.40 and 639.26

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Solution

The fourth proportional to 1,613.69, 2,418.40 and 639.26 is: 958.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.69 : 2,418.40 = 639.26 : x
  2. Step 2: Convert to fraction form
    1,613.69/2,418.40 = 639.26/x
  3. Step 3: Cross multiply
    1,613.69x = 2,418.40 × 639.26
  4. Step 4: Simplify right side
    1,613.69x = 1,545,971.10
  5. Step 5: Solve for x
    x = 1,545,971.10/1,613.69
  6. Step 6: Final answer
    x = 958.04

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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.