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Finding the Fourth Proportional to 791.32, 1,187.15 and 271.36

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Solution

The fourth proportional to 791.32, 1,187.15 and 271.36 is: 407.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.32 : 1,187.15 = 271.36 : x
  2. Step 2: Convert to fraction form
    791.32/1,187.15 = 271.36/x
  3. Step 3: Cross multiply
    791.32x = 1,187.15 × 271.36
  4. Step 4: Simplify right side
    791.32x = 322,145.02
  5. Step 5: Solve for x
    x = 322,145.02/791.32
  6. Step 6: Final answer
    x = 407.10

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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.