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Finding the Fourth Proportional to 1,161.22, 1,741.86 and 931.57

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Solution

The fourth proportional to 1,161.22, 1,741.86 and 931.57 is: 1,397.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.22 : 1,741.86 = 931.57 : x
  2. Step 2: Convert to fraction form
    1,161.22/1,741.86 = 931.57/x
  3. Step 3: Cross multiply
    1,161.22x = 1,741.86 × 931.57
  4. Step 4: Simplify right side
    1,161.22x = 1,622,664.52
  5. Step 5: Solve for x
    x = 1,622,664.52/1,161.22
  6. Step 6: Final answer
    x = 1,397.38

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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.