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Finding the Fourth Proportional to 1,164.90, 1,606.98 and 791.22

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Solution

The fourth proportional to 1,164.90, 1,606.98 and 791.22 is: 1,091.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,164.90 : 1,606.98 = 791.22 : x
  2. Step 2: Convert to fraction form
    1,164.90/1,606.98 = 791.22/x
  3. Step 3: Cross multiply
    1,164.90x = 1,606.98 × 791.22
  4. Step 4: Simplify right side
    1,164.90x = 1,271,474.72
  5. Step 5: Solve for x
    x = 1,271,474.72/1,164.90
  6. Step 6: Final answer
    x = 1,091.49

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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.