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Finding the Fourth Proportional to 1,671.78, 2,505.97 and 1,122.69

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Solution

The fourth proportional to 1,671.78, 2,505.97 and 1,122.69 is: 1,682.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,671.78 : 2,505.97 = 1,122.69 : x
  2. Step 2: Convert to fraction form
    1,671.78/2,505.97 = 1,122.69/x
  3. Step 3: Cross multiply
    1,671.78x = 2,505.97 × 1,122.69
  4. Step 4: Simplify right side
    1,671.78x = 2,813,427.46
  5. Step 5: Solve for x
    x = 2,813,427.46/1,671.78
  6. Step 6: Final answer
    x = 1,682.89

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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.