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Finding the Fourth Proportional to 1,078.11, 1,487.78 and 636.00

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Solution

The fourth proportional to 1,078.11, 1,487.78 and 636.00 is: 877.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.11 : 1,487.78 = 636.00 : x
  2. Step 2: Convert to fraction form
    1,078.11/1,487.78 = 636.00/x
  3. Step 3: Cross multiply
    1,078.11x = 1,487.78 × 636.00
  4. Step 4: Simplify right side
    1,078.11x = 946,233.65
  5. Step 5: Solve for x
    x = 946,233.65/1,078.11
  6. Step 6: Final answer
    x = 877.68

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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.