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Finding the Fourth Proportional to 1,108.81, 1,662.66 and 621.73

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Solution

The fourth proportional to 1,108.81, 1,662.66 and 621.73 is: 932.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.81 : 1,662.66 = 621.73 : x
  2. Step 2: Convert to fraction form
    1,108.81/1,662.66 = 621.73/x
  3. Step 3: Cross multiply
    1,108.81x = 1,662.66 × 621.73
  4. Step 4: Simplify right side
    1,108.81x = 1,033,725.60
  5. Step 5: Solve for x
    x = 1,033,725.60/1,108.81
  6. Step 6: Final answer
    x = 932.28

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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.