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Finding the Fourth Proportional to 791.80, 1,186.08 and 498.40

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Solution

The fourth proportional to 791.80, 1,186.08 and 498.40 is: 746.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.80 : 1,186.08 = 498.40 : x
  2. Step 2: Convert to fraction form
    791.80/1,186.08 = 498.40/x
  3. Step 3: Cross multiply
    791.80x = 1,186.08 × 498.40
  4. Step 4: Simplify right side
    791.80x = 591,142.27
  5. Step 5: Solve for x
    x = 591,142.27/791.80
  6. Step 6: Final answer
    x = 746.58

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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.