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Finding the Fourth Proportional to 1,108.28, 1,662.39 and 286.55

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Solution

The fourth proportional to 1,108.28, 1,662.39 and 286.55 is: 429.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.28 : 1,662.39 = 286.55 : x
  2. Step 2: Convert to fraction form
    1,108.28/1,662.39 = 286.55/x
  3. Step 3: Cross multiply
    1,108.28x = 1,662.39 × 286.55
  4. Step 4: Simplify right side
    1,108.28x = 476,357.85
  5. Step 5: Solve for x
    x = 476,357.85/1,108.28
  6. Step 6: Final answer
    x = 429.82

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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.