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Finding the Fourth Proportional to 660.89, 991.25 and 173.98

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Solution

The fourth proportional to 660.89, 991.25 and 173.98 is: 260.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.89 : 991.25 = 173.98 : x
  2. Step 2: Convert to fraction form
    660.89/991.25 = 173.98/x
  3. Step 3: Cross multiply
    660.89x = 991.25 × 173.98
  4. Step 4: Simplify right side
    660.89x = 172,457.68
  5. Step 5: Solve for x
    x = 172,457.68/660.89
  6. Step 6: Final answer
    x = 260.95

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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.