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Finding the Fourth Proportional to 1,425.45, 2,136.69 and 645.87

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Solution

The fourth proportional to 1,425.45, 2,136.69 and 645.87 is: 968.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.45 : 2,136.69 = 645.87 : x
  2. Step 2: Convert to fraction form
    1,425.45/2,136.69 = 645.87/x
  3. Step 3: Cross multiply
    1,425.45x = 2,136.69 × 645.87
  4. Step 4: Simplify right side
    1,425.45x = 1,380,023.97
  5. Step 5: Solve for x
    x = 1,380,023.97/1,425.45
  6. Step 6: Final answer
    x = 968.13

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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.