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Finding the Fourth Proportional to 285.20, 427.80 and 163.76

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Solution

The fourth proportional to 285.20, 427.80 and 163.76 is: 245.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.20 : 427.80 = 163.76 : x
  2. Step 2: Convert to fraction form
    285.20/427.80 = 163.76/x
  3. Step 3: Cross multiply
    285.20x = 427.80 × 163.76
  4. Step 4: Simplify right side
    285.20x = 70,056.53
  5. Step 5: Solve for x
    x = 70,056.53/285.20
  6. Step 6: Final answer
    x = 245.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.