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Finding the Fourth Proportional to 170.99, 235.98 and 129.47

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Solution

The fourth proportional to 170.99, 235.98 and 129.47 is: 178.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.99 : 235.98 = 129.47 : x
  2. Step 2: Convert to fraction form
    170.99/235.98 = 129.47/x
  3. Step 3: Cross multiply
    170.99x = 235.98 × 129.47
  4. Step 4: Simplify right side
    170.99x = 30,552.33
  5. Step 5: Solve for x
    x = 30,552.33/170.99
  6. Step 6: Final answer
    x = 178.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.