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Finding the Fourth Proportional to 1,161.13, 1,741.70 and 391.63

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Solution

The fourth proportional to 1,161.13, 1,741.70 and 391.63 is: 587.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.13 : 1,741.70 = 391.63 : x
  2. Step 2: Convert to fraction form
    1,161.13/1,741.70 = 391.63/x
  3. Step 3: Cross multiply
    1,161.13x = 1,741.70 × 391.63
  4. Step 4: Simplify right side
    1,161.13x = 682,101.97
  5. Step 5: Solve for x
    x = 682,101.97/1,161.13
  6. Step 6: Final answer
    x = 587.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.