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Finding the Fourth Proportional to 659.73, 989.66 and 172.79

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Solution

The fourth proportional to 659.73, 989.66 and 172.79 is: 259.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.73 : 989.66 = 172.79 : x
  2. Step 2: Convert to fraction form
    659.73/989.66 = 172.79/x
  3. Step 3: Cross multiply
    659.73x = 989.66 × 172.79
  4. Step 4: Simplify right side
    659.73x = 170,997.54
  5. Step 5: Solve for x
    x = 170,997.54/659.73
  6. Step 6: Final answer
    x = 259.19

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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.