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Finding the Fourth Proportional to 1,252.56, 1,878.36 and 636

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Solution

The fourth proportional to 1,252.56, 1,878.36 and 636 is: 953.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.56 : 1,878.36 = 636 : x
  2. Step 2: Convert to fraction form
    1,252.56/1,878.36 = 636/x
  3. Step 3: Cross multiply
    1,252.56x = 1,878.36 × 636
  4. Step 4: Simplify right side
    1,252.56x = 1,194,636.96
  5. Step 5: Solve for x
    x = 1,194,636.96/1,252.56
  6. Step 6: Final answer
    x = 953.76

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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.