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Finding the Fourth Proportional to 791.90, 1,187.86 and 359.06

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Solution

The fourth proportional to 791.90, 1,187.86 and 359.06 is: 538.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.90 : 1,187.86 = 359.06 : x
  2. Step 2: Convert to fraction form
    791.90/1,187.86 = 359.06/x
  3. Step 3: Cross multiply
    791.90x = 1,187.86 × 359.06
  4. Step 4: Simplify right side
    791.90x = 426,513.01
  5. Step 5: Solve for x
    x = 426,513.01/791.90
  6. Step 6: Final answer
    x = 538.59

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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.