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Finding the Fourth Proportional to 659.29, 988.95 and 172.39

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Solution

The fourth proportional to 659.29, 988.95 and 172.39 is: 258.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.29 : 988.95 = 172.39 : x
  2. Step 2: Convert to fraction form
    659.29/988.95 = 172.39/x
  3. Step 3: Cross multiply
    659.29x = 988.95 × 172.39
  4. Step 4: Simplify right side
    659.29x = 170,481.97
  5. Step 5: Solve for x
    x = 170,481.97/659.29
  6. Step 6: Final answer
    x = 258.59

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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.