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Finding the Fourth Proportional to 802.26, 1,201.89 and 639.75

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Solution

The fourth proportional to 802.26, 1,201.89 and 639.75 is: 958.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    802.26 : 1,201.89 = 639.75 : x
  2. Step 2: Convert to fraction form
    802.26/1,201.89 = 639.75/x
  3. Step 3: Cross multiply
    802.26x = 1,201.89 × 639.75
  4. Step 4: Simplify right side
    802.26x = 768,909.13
  5. Step 5: Solve for x
    x = 768,909.13/802.26
  6. Step 6: Final answer
    x = 958.43

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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.