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Finding the Fourth Proportional to 1,078.38, 1,487.99 and 636.22

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Solution

The fourth proportional to 1,078.38, 1,487.99 and 636.22 is: 877.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.38 : 1,487.99 = 636.22 : x
  2. Step 2: Convert to fraction form
    1,078.38/1,487.99 = 636.22/x
  3. Step 3: Cross multiply
    1,078.38x = 1,487.99 × 636.22
  4. Step 4: Simplify right side
    1,078.38x = 946,689.00
  5. Step 5: Solve for x
    x = 946,689.00/1,078.38
  6. Step 6: Final answer
    x = 877.88

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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.