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Finding the Fourth Proportional to 285.64, 428.46 and 69.22

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Solution

The fourth proportional to 285.64, 428.46 and 69.22 is: 103.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.64 : 428.46 = 69.22 : x
  2. Step 2: Convert to fraction form
    285.64/428.46 = 69.22/x
  3. Step 3: Cross multiply
    285.64x = 428.46 × 69.22
  4. Step 4: Simplify right side
    285.64x = 29,659.07
  5. Step 5: Solve for x
    x = 29,659.07/285.64
  6. Step 6: Final answer
    x = 103.83

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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.