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Finding the Fourth Proportional to 1,326.82, 1,990.30 and 505.16

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Solution

The fourth proportional to 1,326.82, 1,990.30 and 505.16 is: 757.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.82 : 1,990.30 = 505.16 : x
  2. Step 2: Convert to fraction form
    1,326.82/1,990.30 = 505.16/x
  3. Step 3: Cross multiply
    1,326.82x = 1,990.30 × 505.16
  4. Step 4: Simplify right side
    1,326.82x = 1,005,419.95
  5. Step 5: Solve for x
    x = 1,005,419.95/1,326.82
  6. Step 6: Final answer
    x = 757.77

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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.