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Finding the Fourth Proportional to 920.49, 1,373.99 and 791.31

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Solution

The fourth proportional to 920.49, 1,373.99 and 791.31 is: 1,181.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.49 : 1,373.99 = 791.31 : x
  2. Step 2: Convert to fraction form
    920.49/1,373.99 = 791.31/x
  3. Step 3: Cross multiply
    920.49x = 1,373.99 × 791.31
  4. Step 4: Simplify right side
    920.49x = 1,087,252.03
  5. Step 5: Solve for x
    x = 1,087,252.03/920.49
  6. Step 6: Final answer
    x = 1,181.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.