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Finding the Fourth Proportional to 170.50, 235.20 and 121.36

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Solution

The fourth proportional to 170.50, 235.20 and 121.36 is: 167.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.50 : 235.20 = 121.36 : x
  2. Step 2: Convert to fraction form
    170.50/235.20 = 121.36/x
  3. Step 3: Cross multiply
    170.50x = 235.20 × 121.36
  4. Step 4: Simplify right side
    170.50x = 28,543.87
  5. Step 5: Solve for x
    x = 28,543.87/170.50
  6. Step 6: Final answer
    x = 167.41

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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.