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Finding the Fourth Proportional to 708.96, 978.48 and 636

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Solution

The fourth proportional to 708.96, 978.48 and 636 is: 877.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.96 : 978.48 = 636 : x
  2. Step 2: Convert to fraction form
    708.96/978.48 = 636/x
  3. Step 3: Cross multiply
    708.96x = 978.48 × 636
  4. Step 4: Simplify right side
    708.96x = 622,313.28
  5. Step 5: Solve for x
    x = 622,313.28/708.96
  6. Step 6: Final answer
    x = 877.78

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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.