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Finding the Fourth Proportional to 170.60, 235.28 and 121.40

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Solution

The fourth proportional to 170.60, 235.28 and 121.40 is: 167.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.60 : 235.28 = 121.40 : x
  2. Step 2: Convert to fraction form
    170.60/235.28 = 121.40/x
  3. Step 3: Cross multiply
    170.60x = 235.28 × 121.40
  4. Step 4: Simplify right side
    170.60x = 28,562.99
  5. Step 5: Solve for x
    x = 28,562.99/170.60
  6. Step 6: Final answer
    x = 167.43

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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.