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Finding the Fourth Proportional to 1,424.28, 2,135.79 and 644.25

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Solution

The fourth proportional to 1,424.28, 2,135.79 and 644.25 is: 966.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.28 : 2,135.79 = 644.25 : x
  2. Step 2: Convert to fraction form
    1,424.28/2,135.79 = 644.25/x
  3. Step 3: Cross multiply
    1,424.28x = 2,135.79 × 644.25
  4. Step 4: Simplify right side
    1,424.28x = 1,375,986.52
  5. Step 5: Solve for x
    x = 1,375,986.52/1,424.28
  6. Step 6: Final answer
    x = 966.09

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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.