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Finding the Fourth Proportional to 1,118.50, 1,676.09 and 811.04

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Solution

The fourth proportional to 1,118.50, 1,676.09 and 811.04 is: 1,215.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.50 : 1,676.09 = 811.04 : x
  2. Step 2: Convert to fraction form
    1,118.50/1,676.09 = 811.04/x
  3. Step 3: Cross multiply
    1,118.50x = 1,676.09 × 811.04
  4. Step 4: Simplify right side
    1,118.50x = 1,359,369.68
  5. Step 5: Solve for x
    x = 1,359,369.68/1,118.50
  6. Step 6: Final answer
    x = 1,215.35

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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.