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Finding the Fourth Proportional to 886.60, 1,330.41 and 639.55

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Solution

The fourth proportional to 886.60, 1,330.41 and 639.55 is: 959.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.60 : 1,330.41 = 639.55 : x
  2. Step 2: Convert to fraction form
    886.60/1,330.41 = 639.55/x
  3. Step 3: Cross multiply
    886.60x = 1,330.41 × 639.55
  4. Step 4: Simplify right side
    886.60x = 850,863.72
  5. Step 5: Solve for x
    x = 850,863.72/886.60
  6. Step 6: Final answer
    x = 959.69

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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.