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Finding the Fourth Proportional to 790.85, 1,186.20 and 213.72

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Solution

The fourth proportional to 790.85, 1,186.20 and 213.72 is: 320.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.85 : 1,186.20 = 213.72 : x
  2. Step 2: Convert to fraction form
    790.85/1,186.20 = 213.72/x
  3. Step 3: Cross multiply
    790.85x = 1,186.20 × 213.72
  4. Step 4: Simplify right side
    790.85x = 253,514.66
  5. Step 5: Solve for x
    x = 253,514.66/790.85
  6. Step 6: Final answer
    x = 320.56

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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.