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Finding the Fourth Proportional to 851.58, 1,176.89 and 664.88

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Solution

The fourth proportional to 851.58, 1,176.89 and 664.88 is: 918.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.58 : 1,176.89 = 664.88 : x
  2. Step 2: Convert to fraction form
    851.58/1,176.89 = 664.88/x
  3. Step 3: Cross multiply
    851.58x = 1,176.89 × 664.88
  4. Step 4: Simplify right side
    851.58x = 782,481.41
  5. Step 5: Solve for x
    x = 782,481.41/851.58
  6. Step 6: Final answer
    x = 918.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.