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Finding the Fourth Proportional to 790.32, 1,185.45 and 213.21

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Solution

The fourth proportional to 790.32, 1,185.45 and 213.21 is: 319.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.32 : 1,185.45 = 213.21 : x
  2. Step 2: Convert to fraction form
    790.32/1,185.45 = 213.21/x
  3. Step 3: Cross multiply
    790.32x = 1,185.45 × 213.21
  4. Step 4: Simplify right side
    790.32x = 252,749.79
  5. Step 5: Solve for x
    x = 252,749.79/790.32
  6. Step 6: Final answer
    x = 319.81

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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.