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Finding the Fourth Proportional to 1,783.11, 2,675 and 687.38

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Solution

The fourth proportional to 1,783.11, 2,675 and 687.38 is: 1,031.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,783.11 : 2,675 = 687.38 : x
  2. Step 2: Convert to fraction form
    1,783.11/2,675 = 687.38/x
  3. Step 3: Cross multiply
    1,783.11x = 2,675 × 687.38
  4. Step 4: Simplify right side
    1,783.11x = 1,838,741.50
  5. Step 5: Solve for x
    x = 1,838,741.50/1,783.11
  6. Step 6: Final answer
    x = 1,031.20

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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.