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Finding the Fourth Proportional to 1,138.83, 1,705.50 and 676.22

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Solution

The fourth proportional to 1,138.83, 1,705.50 and 676.22 is: 1,012.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.83 : 1,705.50 = 676.22 : x
  2. Step 2: Convert to fraction form
    1,138.83/1,705.50 = 676.22/x
  3. Step 3: Cross multiply
    1,138.83x = 1,705.50 × 676.22
  4. Step 4: Simplify right side
    1,138.83x = 1,153,284.68
  5. Step 5: Solve for x
    x = 1,153,284.68/1,138.83
  6. Step 6: Final answer
    x = 1,012.69

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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.