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Finding the Fourth Proportional to 837.40, 1,256.10 and 664.60

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Solution

The fourth proportional to 837.40, 1,256.10 and 664.60 is: 996.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.40 : 1,256.10 = 664.60 : x
  2. Step 2: Convert to fraction form
    837.40/1,256.10 = 664.60/x
  3. Step 3: Cross multiply
    837.40x = 1,256.10 × 664.60
  4. Step 4: Simplify right side
    837.40x = 834,804.06
  5. Step 5: Solve for x
    x = 834,804.06/837.40
  6. Step 6: Final answer
    x = 996.90

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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.