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Finding the Fourth Proportional to 1,171.53, 1,757.43 and 391.38

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Solution

The fourth proportional to 1,171.53, 1,757.43 and 391.38 is: 587.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.53 : 1,757.43 = 391.38 : x
  2. Step 2: Convert to fraction form
    1,171.53/1,757.43 = 391.38/x
  3. Step 3: Cross multiply
    1,171.53x = 1,757.43 × 391.38
  4. Step 4: Simplify right side
    1,171.53x = 687,822.95
  5. Step 5: Solve for x
    x = 687,822.95/1,171.53
  6. Step 6: Final answer
    x = 587.12

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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.