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Finding the Fourth Proportional to 660.60, 989.76 and 633.60

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Solution

The fourth proportional to 660.60, 989.76 and 633.60 is: 949.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.60 : 989.76 = 633.60 : x
  2. Step 2: Convert to fraction form
    660.60/989.76 = 633.60/x
  3. Step 3: Cross multiply
    660.60x = 989.76 × 633.60
  4. Step 4: Simplify right side
    660.60x = 627,111.94
  5. Step 5: Solve for x
    x = 627,111.94/660.60
  6. Step 6: Final answer
    x = 949.31

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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.