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Finding the Fourth Proportional to 791.42, 1,091.14 and 649.10

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Solution

The fourth proportional to 791.42, 1,091.14 and 649.10 is: 894.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.42 : 1,091.14 = 649.10 : x
  2. Step 2: Convert to fraction form
    791.42/1,091.14 = 649.10/x
  3. Step 3: Cross multiply
    791.42x = 1,091.14 × 649.10
  4. Step 4: Simplify right side
    791.42x = 708,258.46
  5. Step 5: Solve for x
    x = 708,258.46/791.42
  6. Step 6: Final answer
    x = 894.92

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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.