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Finding the Fourth Proportional to 1,690.44, 2,333.14 and 991.82

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Solution

The fourth proportional to 1,690.44, 2,333.14 and 991.82 is: 1,368.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.44 : 2,333.14 = 991.82 : x
  2. Step 2: Convert to fraction form
    1,690.44/2,333.14 = 991.82/x
  3. Step 3: Cross multiply
    1,690.44x = 2,333.14 × 991.82
  4. Step 4: Simplify right side
    1,690.44x = 2,314,054.91
  5. Step 5: Solve for x
    x = 2,314,054.91/1,690.44
  6. Step 6: Final answer
    x = 1,368.91

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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.