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Finding the Fourth Proportional to 1,326.97, 1,991.99 and 711.88

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Solution

The fourth proportional to 1,326.97, 1,991.99 and 711.88 is: 1,068.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.97 : 1,991.99 = 711.88 : x
  2. Step 2: Convert to fraction form
    1,326.97/1,991.99 = 711.88/x
  3. Step 3: Cross multiply
    1,326.97x = 1,991.99 × 711.88
  4. Step 4: Simplify right side
    1,326.97x = 1,418,054.64
  5. Step 5: Solve for x
    x = 1,418,054.64/1,326.97
  6. Step 6: Final answer
    x = 1,068.64

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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.