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Finding the Fourth Proportional to 791.87, 1,091.87 and 507.91

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Solution

The fourth proportional to 791.87, 1,091.87 and 507.91 is: 700.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.87 : 1,091.87 = 507.91 : x
  2. Step 2: Convert to fraction form
    791.87/1,091.87 = 507.91/x
  3. Step 3: Cross multiply
    791.87x = 1,091.87 × 507.91
  4. Step 4: Simplify right side
    791.87x = 554,563.69
  5. Step 5: Solve for x
    x = 554,563.69/791.87
  6. Step 6: Final answer
    x = 700.33

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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.