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Finding the Fourth Proportional to 804.15, 1,207.44 and 641.34

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Solution

The fourth proportional to 804.15, 1,207.44 and 641.34 is: 962.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.15 : 1,207.44 = 641.34 : x
  2. Step 2: Convert to fraction form
    804.15/1,207.44 = 641.34/x
  3. Step 3: Cross multiply
    804.15x = 1,207.44 × 641.34
  4. Step 4: Simplify right side
    804.15x = 774,379.57
  5. Step 5: Solve for x
    x = 774,379.57/804.15
  6. Step 6: Final answer
    x = 962.98

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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.