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Finding the Fourth Proportional to 804.12, 1,205.56 and 641.71

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Solution

The fourth proportional to 804.12, 1,205.56 and 641.71 is: 962.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.12 : 1,205.56 = 641.71 : x
  2. Step 2: Convert to fraction form
    804.12/1,205.56 = 641.71/x
  3. Step 3: Cross multiply
    804.12x = 1,205.56 × 641.71
  4. Step 4: Simplify right side
    804.12x = 773,619.91
  5. Step 5: Solve for x
    x = 773,619.91/804.12
  6. Step 6: Final answer
    x = 962.07

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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.