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Finding the Fourth Proportional to 790.38, 1,185.63 and 213.25

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Solution

The fourth proportional to 790.38, 1,185.63 and 213.25 is: 319.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.38 : 1,185.63 = 213.25 : x
  2. Step 2: Convert to fraction form
    790.38/1,185.63 = 213.25/x
  3. Step 3: Cross multiply
    790.38x = 1,185.63 × 213.25
  4. Step 4: Simplify right side
    790.38x = 252,835.60
  5. Step 5: Solve for x
    x = 252,835.60/790.38
  6. Step 6: Final answer
    x = 319.89

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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.