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Finding the Fourth Proportional to 791.02, 1,186.38 and 213.76

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Solution

The fourth proportional to 791.02, 1,186.38 and 213.76 is: 320.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.02 : 1,186.38 = 213.76 : x
  2. Step 2: Convert to fraction form
    791.02/1,186.38 = 213.76/x
  3. Step 3: Cross multiply
    791.02x = 1,186.38 × 213.76
  4. Step 4: Simplify right side
    791.02x = 253,600.59
  5. Step 5: Solve for x
    x = 253,600.59/791.02
  6. Step 6: Final answer
    x = 320.60

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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.