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Finding the Fourth Proportional to 1,721.60, 2,375.78 and 935.66

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Solution

The fourth proportional to 1,721.60, 2,375.78 and 935.66 is: 1,291.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.60 : 2,375.78 = 935.66 : x
  2. Step 2: Convert to fraction form
    1,721.60/2,375.78 = 935.66/x
  3. Step 3: Cross multiply
    1,721.60x = 2,375.78 × 935.66
  4. Step 4: Simplify right side
    1,721.60x = 2,222,922.31
  5. Step 5: Solve for x
    x = 2,222,922.31/1,721.60
  6. Step 6: Final answer
    x = 1,291.20

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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.