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Finding the Fourth Proportional to 1,613.13, 2,419.69 and 639.91

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Solution

The fourth proportional to 1,613.13, 2,419.69 and 639.91 is: 959.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.13 : 2,419.69 = 639.91 : x
  2. Step 2: Convert to fraction form
    1,613.13/2,419.69 = 639.91/x
  3. Step 3: Cross multiply
    1,613.13x = 2,419.69 × 639.91
  4. Step 4: Simplify right side
    1,613.13x = 1,548,383.83
  5. Step 5: Solve for x
    x = 1,548,383.83/1,613.13
  6. Step 6: Final answer
    x = 959.86

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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.