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Finding the Fourth Proportional to 968.46, 1,335.60 and 636.77

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Solution

The fourth proportional to 968.46, 1,335.60 and 636.77 is: 878.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.46 : 1,335.60 = 636.77 : x
  2. Step 2: Convert to fraction form
    968.46/1,335.60 = 636.77/x
  3. Step 3: Cross multiply
    968.46x = 1,335.60 × 636.77
  4. Step 4: Simplify right side
    968.46x = 850,470.01
  5. Step 5: Solve for x
    x = 850,470.01/968.46
  6. Step 6: Final answer
    x = 878.17

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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.