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Finding the Fourth Proportional to 1,138.74, 1,706.39 and 676.74

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Solution

The fourth proportional to 1,138.74, 1,706.39 and 676.74 is: 1,014.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.74 : 1,706.39 = 676.74 : x
  2. Step 2: Convert to fraction form
    1,138.74/1,706.39 = 676.74/x
  3. Step 3: Cross multiply
    1,138.74x = 1,706.39 × 676.74
  4. Step 4: Simplify right side
    1,138.74x = 1,154,778.98
  5. Step 5: Solve for x
    x = 1,154,778.98/1,138.74
  6. Step 6: Final answer
    x = 1,014.08

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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.