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Finding the Fourth Proportional to 160.76, 221.46 and 111.55

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Solution

The fourth proportional to 160.76, 221.46 and 111.55 is: 153.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.76 : 221.46 = 111.55 : x
  2. Step 2: Convert to fraction form
    160.76/221.46 = 111.55/x
  3. Step 3: Cross multiply
    160.76x = 221.46 × 111.55
  4. Step 4: Simplify right side
    160.76x = 24,703.86
  5. Step 5: Solve for x
    x = 24,703.86/160.76
  6. Step 6: Final answer
    x = 153.67

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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.