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Finding the Fourth Proportional to 1,425.89, 2,136.91 and 644.92

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Solution

The fourth proportional to 1,425.89, 2,136.91 and 644.92 is: 966.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.89 : 2,136.91 = 644.92 : x
  2. Step 2: Convert to fraction form
    1,425.89/2,136.91 = 644.92/x
  3. Step 3: Cross multiply
    1,425.89x = 2,136.91 × 644.92
  4. Step 4: Simplify right side
    1,425.89x = 1,378,136.00
  5. Step 5: Solve for x
    x = 1,378,136.00/1,425.89
  6. Step 6: Final answer
    x = 966.51

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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.