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Finding the Fourth Proportional to 1,142.75, 1,576.90 and 645.43

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Solution

The fourth proportional to 1,142.75, 1,576.90 and 645.43 is: 890.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.75 : 1,576.90 = 645.43 : x
  2. Step 2: Convert to fraction form
    1,142.75/1,576.90 = 645.43/x
  3. Step 3: Cross multiply
    1,142.75x = 1,576.90 × 645.43
  4. Step 4: Simplify right side
    1,142.75x = 1,017,778.57
  5. Step 5: Solve for x
    x = 1,017,778.57/1,142.75
  6. Step 6: Final answer
    x = 890.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.