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Finding the Fourth Proportional to 285.28, 427.88 and 189.16

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Solution

The fourth proportional to 285.28, 427.88 and 189.16 is: 283.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.28 : 427.88 = 189.16 : x
  2. Step 2: Convert to fraction form
    285.28/427.88 = 189.16/x
  3. Step 3: Cross multiply
    285.28x = 427.88 × 189.16
  4. Step 4: Simplify right side
    285.28x = 80,937.78
  5. Step 5: Solve for x
    x = 80,937.78/285.28
  6. Step 6: Final answer
    x = 283.71

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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.