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Finding the Fourth Proportional to 660.39, 990.60 and 173.43

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Solution

The fourth proportional to 660.39, 990.60 and 173.43 is: 260.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.39 : 990.60 = 173.43 : x
  2. Step 2: Convert to fraction form
    660.39/990.60 = 173.43/x
  3. Step 3: Cross multiply
    660.39x = 990.60 × 173.43
  4. Step 4: Simplify right side
    660.39x = 171,799.76
  5. Step 5: Solve for x
    x = 171,799.76/660.39
  6. Step 6: Final answer
    x = 260.15

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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.