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Finding the Fourth Proportional to 804.96, 1,207.20 and 439.92

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Solution

The fourth proportional to 804.96, 1,207.20 and 439.92 is: 659.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.96 : 1,207.20 = 439.92 : x
  2. Step 2: Convert to fraction form
    804.96/1,207.20 = 439.92/x
  3. Step 3: Cross multiply
    804.96x = 1,207.20 × 439.92
  4. Step 4: Simplify right side
    804.96x = 531,071.42
  5. Step 5: Solve for x
    x = 531,071.42/804.96
  6. Step 6: Final answer
    x = 659.75

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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.