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Finding the Fourth Proportional to 1,326.80, 1,990.52 and 461.11

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Solution

The fourth proportional to 1,326.80, 1,990.52 and 461.11 is: 691.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.80 : 1,990.52 = 461.11 : x
  2. Step 2: Convert to fraction form
    1,326.80/1,990.52 = 461.11/x
  3. Step 3: Cross multiply
    1,326.80x = 1,990.52 × 461.11
  4. Step 4: Simplify right side
    1,326.80x = 917,849.45
  5. Step 5: Solve for x
    x = 917,849.45/1,326.80
  6. Step 6: Final answer
    x = 691.78

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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.