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Finding the Fourth Proportional to 660.48, 990.64 and 173.49

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Solution

The fourth proportional to 660.48, 990.64 and 173.49 is: 260.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.48 : 990.64 = 173.49 : x
  2. Step 2: Convert to fraction form
    660.48/990.64 = 173.49/x
  3. Step 3: Cross multiply
    660.48x = 990.64 × 173.49
  4. Step 4: Simplify right side
    660.48x = 171,866.13
  5. Step 5: Solve for x
    x = 171,866.13/660.48
  6. Step 6: Final answer
    x = 260.21

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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.