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Finding the Fourth Proportional to 1,326.58, 1,989.56 and 779.83

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Solution

The fourth proportional to 1,326.58, 1,989.56 and 779.83 is: 1,169.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.58 : 1,989.56 = 779.83 : x
  2. Step 2: Convert to fraction form
    1,326.58/1,989.56 = 779.83/x
  3. Step 3: Cross multiply
    1,326.58x = 1,989.56 × 779.83
  4. Step 4: Simplify right side
    1,326.58x = 1,551,515.55
  5. Step 5: Solve for x
    x = 1,551,515.55/1,326.58
  6. Step 6: Final answer
    x = 1,169.56

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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.