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Finding the Fourth Proportional to 1,721.66, 2,375.89 and 935.71

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Solution

The fourth proportional to 1,721.66, 2,375.89 and 935.71 is: 1,291.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.66 : 2,375.89 = 935.71 : x
  2. Step 2: Convert to fraction form
    1,721.66/2,375.89 = 935.71/x
  3. Step 3: Cross multiply
    1,721.66x = 2,375.89 × 935.71
  4. Step 4: Simplify right side
    1,721.66x = 2,223,135.75
  5. Step 5: Solve for x
    x = 2,223,135.75/1,721.66
  6. Step 6: Final answer
    x = 1,291.28

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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.