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Finding the Fourth Proportional to 1,327.19, 1,990.17 and 779.63

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Solution

The fourth proportional to 1,327.19, 1,990.17 and 779.63 is: 1,169.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.19 : 1,990.17 = 779.63 : x
  2. Step 2: Convert to fraction form
    1,327.19/1,990.17 = 779.63/x
  3. Step 3: Cross multiply
    1,327.19x = 1,990.17 × 779.63
  4. Step 4: Simplify right side
    1,327.19x = 1,551,586.29
  5. Step 5: Solve for x
    x = 1,551,586.29/1,327.19
  6. Step 6: Final answer
    x = 1,169.08

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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.