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Finding the Fourth Proportional to 1,252.78, 1,879.62 and 636.02

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Solution

The fourth proportional to 1,252.78, 1,879.62 and 636.02 is: 954.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.78 : 1,879.62 = 636.02 : x
  2. Step 2: Convert to fraction form
    1,252.78/1,879.62 = 636.02/x
  3. Step 3: Cross multiply
    1,252.78x = 1,879.62 × 636.02
  4. Step 4: Simplify right side
    1,252.78x = 1,195,475.91
  5. Step 5: Solve for x
    x = 1,195,475.91/1,252.78
  6. Step 6: Final answer
    x = 954.26

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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.