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Finding the Fourth Proportional to 791.61, 1,092.39 and 643.98

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Solution

The fourth proportional to 791.61, 1,092.39 and 643.98 is: 888.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.61 : 1,092.39 = 643.98 : x
  2. Step 2: Convert to fraction form
    791.61/1,092.39 = 643.98/x
  3. Step 3: Cross multiply
    791.61x = 1,092.39 × 643.98
  4. Step 4: Simplify right side
    791.61x = 703,478.99
  5. Step 5: Solve for x
    x = 703,478.99/791.61
  6. Step 6: Final answer
    x = 888.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.