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Finding the Fourth Proportional to 2,137.61, 3,206.81 and 676.64

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Solution

The fourth proportional to 2,137.61, 3,206.81 and 676.64 is: 1,015.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,137.61 : 3,206.81 = 676.64 : x
  2. Step 2: Convert to fraction form
    2,137.61/3,206.81 = 676.64/x
  3. Step 3: Cross multiply
    2,137.61x = 3,206.81 × 676.64
  4. Step 4: Simplify right side
    2,137.61x = 2,169,841.58
  5. Step 5: Solve for x
    x = 2,169,841.58/2,137.61
  6. Step 6: Final answer
    x = 1,015.08

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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.