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Finding the Fourth Proportional to 1,161.53, 1,742.23 and 381.43

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Solution

The fourth proportional to 1,161.53, 1,742.23 and 381.43 is: 572.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.53 : 1,742.23 = 381.43 : x
  2. Step 2: Convert to fraction form
    1,161.53/1,742.23 = 381.43/x
  3. Step 3: Cross multiply
    1,161.53x = 1,742.23 × 381.43
  4. Step 4: Simplify right side
    1,161.53x = 664,538.79
  5. Step 5: Solve for x
    x = 664,538.79/1,161.53
  6. Step 6: Final answer
    x = 572.12

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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.