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Finding the Fourth Proportional to 160.56, 221.28 and 121.68

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Solution

The fourth proportional to 160.56, 221.28 and 121.68 is: 167.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.56 : 221.28 = 121.68 : x
  2. Step 2: Convert to fraction form
    160.56/221.28 = 121.68/x
  3. Step 3: Cross multiply
    160.56x = 221.28 × 121.68
  4. Step 4: Simplify right side
    160.56x = 26,925.35
  5. Step 5: Solve for x
    x = 26,925.35/160.56
  6. Step 6: Final answer
    x = 167.70

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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.