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Finding the Fourth Proportional to 1,108.15, 1,662.81 and 847.99

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Solution

The fourth proportional to 1,108.15, 1,662.81 and 847.99 is: 1,272.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.15 : 1,662.81 = 847.99 : x
  2. Step 2: Convert to fraction form
    1,108.15/1,662.81 = 847.99/x
  3. Step 3: Cross multiply
    1,108.15x = 1,662.81 × 847.99
  4. Step 4: Simplify right side
    1,108.15x = 1,410,046.25
  5. Step 5: Solve for x
    x = 1,410,046.25/1,108.15
  6. Step 6: Final answer
    x = 1,272.43

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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.