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Finding the Fourth Proportional to 285.56, 428.36 and 80.16

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Solution

The fourth proportional to 285.56, 428.36 and 80.16 is: 120.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.56 : 428.36 = 80.16 : x
  2. Step 2: Convert to fraction form
    285.56/428.36 = 80.16/x
  3. Step 3: Cross multiply
    285.56x = 428.36 × 80.16
  4. Step 4: Simplify right side
    285.56x = 34,335.33
  5. Step 5: Solve for x
    x = 34,335.33/285.56
  6. Step 6: Final answer
    x = 120.24

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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.