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Finding the Fourth Proportional to 836.66, 1,255.80 and 639.82

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Solution

The fourth proportional to 836.66, 1,255.80 and 639.82 is: 960.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.66 : 1,255.80 = 639.82 : x
  2. Step 2: Convert to fraction form
    836.66/1,255.80 = 639.82/x
  3. Step 3: Cross multiply
    836.66x = 1,255.80 × 639.82
  4. Step 4: Simplify right side
    836.66x = 803,485.96
  5. Step 5: Solve for x
    x = 803,485.96/836.66
  6. Step 6: Final answer
    x = 960.35

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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.