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Finding the Fourth Proportional to 1,788.62, 2,468.31 and 991.95

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Solution

The fourth proportional to 1,788.62, 2,468.31 and 991.95 is: 1,368.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,788.62 : 2,468.31 = 991.95 : x
  2. Step 2: Convert to fraction form
    1,788.62/2,468.31 = 991.95/x
  3. Step 3: Cross multiply
    1,788.62x = 2,468.31 × 991.95
  4. Step 4: Simplify right side
    1,788.62x = 2,448,450.74
  5. Step 5: Solve for x
    x = 2,448,450.74/1,788.62
  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.