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Finding the Fourth Proportional to 1,136.45, 1,568.25 and 639.06

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Solution

The fourth proportional to 1,136.45, 1,568.25 and 639.06 is: 881.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.45 : 1,568.25 = 639.06 : x
  2. Step 2: Convert to fraction form
    1,136.45/1,568.25 = 639.06/x
  3. Step 3: Cross multiply
    1,136.45x = 1,568.25 × 639.06
  4. Step 4: Simplify right side
    1,136.45x = 1,002,205.85
  5. Step 5: Solve for x
    x = 1,002,205.85/1,136.45
  6. Step 6: Final answer
    x = 881.88

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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.