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Finding the Fourth Proportional to 660.09, 990.08 and 173.19

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Solution

The fourth proportional to 660.09, 990.08 and 173.19 is: 259.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.09 : 990.08 = 173.19 : x
  2. Step 2: Convert to fraction form
    660.09/990.08 = 173.19/x
  3. Step 3: Cross multiply
    660.09x = 990.08 × 173.19
  4. Step 4: Simplify right side
    660.09x = 171,471.09
  5. Step 5: Solve for x
    x = 171,471.09/660.09
  6. Step 6: Final answer
    x = 259.77

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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.