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Finding the Fourth Proportional to 791.18, 1,090.49 and 555.20

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Solution

The fourth proportional to 791.18, 1,090.49 and 555.20 is: 765.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.18 : 1,090.49 = 555.20 : x
  2. Step 2: Convert to fraction form
    791.18/1,090.49 = 555.20/x
  3. Step 3: Cross multiply
    791.18x = 1,090.49 × 555.20
  4. Step 4: Simplify right side
    791.18x = 605,440.05
  5. Step 5: Solve for x
    x = 605,440.05/791.18
  6. Step 6: Final answer
    x = 765.24

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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.