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Finding the Fourth Proportional to 790.82, 1,186.22 and 213.69

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Solution

The fourth proportional to 790.82, 1,186.22 and 213.69 is: 320.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.82 : 1,186.22 = 213.69 : x
  2. Step 2: Convert to fraction form
    790.82/1,186.22 = 213.69/x
  3. Step 3: Cross multiply
    790.82x = 1,186.22 × 213.69
  4. Step 4: Simplify right side
    790.82x = 253,483.35
  5. Step 5: Solve for x
    x = 253,483.35/790.82
  6. Step 6: Final answer
    x = 320.53

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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.