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Finding the Fourth Proportional to 285.18, 427.96 and 122.88

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Solution

The fourth proportional to 285.18, 427.96 and 122.88 is: 184.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.18 : 427.96 = 122.88 : x
  2. Step 2: Convert to fraction form
    285.18/427.96 = 122.88/x
  3. Step 3: Cross multiply
    285.18x = 427.96 × 122.88
  4. Step 4: Simplify right side
    285.18x = 52,587.72
  5. Step 5: Solve for x
    x = 52,587.72/285.18
  6. Step 6: Final answer
    x = 184.40

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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.