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Finding the Fourth Proportional to 285.61, 428.10 and 163.62

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Solution

The fourth proportional to 285.61, 428.10 and 163.62 is: 245.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.61 : 428.10 = 163.62 : x
  2. Step 2: Convert to fraction form
    285.61/428.10 = 163.62/x
  3. Step 3: Cross multiply
    285.61x = 428.10 × 163.62
  4. Step 4: Simplify right side
    285.61x = 70,045.72
  5. Step 5: Solve for x
    x = 70,045.72/285.61
  6. Step 6: Final answer
    x = 245.25

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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.