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Finding the Fourth Proportional to 1,381.04, 1,905.30 and 791.26

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Solution

The fourth proportional to 1,381.04, 1,905.30 and 791.26 is: 1,091.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.04 : 1,905.30 = 791.26 : x
  2. Step 2: Convert to fraction form
    1,381.04/1,905.30 = 791.26/x
  3. Step 3: Cross multiply
    1,381.04x = 1,905.30 × 791.26
  4. Step 4: Simplify right side
    1,381.04x = 1,507,587.68
  5. Step 5: Solve for x
    x = 1,507,587.68/1,381.04
  6. Step 6: Final answer
    x = 1,091.63

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1.5x scale

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.