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Finding the Fourth Proportional to 660.17, 990.17 and 173.26

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Solution

The fourth proportional to 660.17, 990.17 and 173.26 is: 259.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.17 : 990.17 = 173.26 : x
  2. Step 2: Convert to fraction form
    660.17/990.17 = 173.26/x
  3. Step 3: Cross multiply
    660.17x = 990.17 × 173.26
  4. Step 4: Simplify right side
    660.17x = 171,558.85
  5. Step 5: Solve for x
    x = 171,558.85/660.17
  6. Step 6: Final answer
    x = 259.87

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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.